How to Write a Complaint Letter That Gets a Result
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A complaint letter puts a problem in writing, names what you want, and starts a dated record you can use if the company does nothing. Everything here is for the consumer side: a faulty product, a service that failed, a company that will not put it right. Writing to a supplier on behalf of your business? Use the complaint letter to a supplier instead.
Two things decide whether a complaint letter works: a specific request with a date on it, and a paper trail that holds up at the next step. Most letters have neither, which is why they get filed and forgotten.
What to include
Give the company everything it needs to find your transaction without writing back to ask:
- Your details. Name, address, phone, email, and the account or order number.
- The product or service. The exact name, plus the model and serial number where there is one.
- Where and when you bought it. The store or website and the date of purchase, with the amount paid.
- What went wrong. The facts in order, with dates. Keep it factual and short.
- What you already tried. Calls, visits, repair attempts, reference numbers, and who you spoke to. This is the part most letters leave out, and it is what shows the company that the usual "please contact support" reply will not do.
- What you want, and by when. A refund, a repair, a replacement, or a specific correction, with a date.
- Copies of your evidence. Receipts, warranty, work orders, photographs. Send copies and keep every original.
Ask for one thing, and put a date on it
"I hope you can resolve this" gives the company nothing to act on and nothing to miss. Name the remedy you want, in the amount you want, by a calendar date: "a refund of $429.99 within 14 days of this letter." A dated request does two jobs. It tells whoever reads the letter what closing the file looks like, and when the date passes with no reply, you have a clean fact for the regulator, the card issuer, or the small claims form: you asked, in writing, and they did not answer by the date you set.
Fourteen days is reasonable for most consumer complaints. Give thirty if the company has to collect the item or run an inspection.
Keep the tone flat
Write it the way you would want to receive it. Anger, sarcasm, and threats give the reader a reason to treat you as the problem, and they do not survive being forwarded to a manager. The FTC gives the same advice for a practical reason: a civil letter full of dates and reference numbers is the one that gets acted on, because it is the one an employee can attach to a case and close.
A complete example
This one covers a warranty failure after two repairs that did not hold. Notice how much of it is dates and reference numbers, and that the history of what was already tried does the heavy work.
412 Fillmore Street, Denver, CO 80206
marcus.bell@example.com | (303) 555-0164
25 July 2026
Customer Relations
Northline Appliances
2100 Commerce Drive, Columbus, OH 43215
Re: Dishwasher model ND-450, serial 8837-2291, order 77-40912
Dear Customer Relations,
I am writing about a Northline ND-450 dishwasher I bought on 3 February 2026 from Front Range Home, Denver, for $429.99. It is under your two-year warranty.
The machine stopped draining on 14 April. Your service partner attended on 22 April (job 5512) and replaced the pump. It failed the same way on 2 June. A second technician attended on 9 June (job 6018), found the same fault, and told me the part was on back order. I have heard nothing since, and the machine has now been unusable for seven weeks.
I have given your service network two attempts to repair it. I am asking for a replacement unit or a full refund of $429.99, whichever you prefer, within 14 days of the date of this letter. I can make the machine available for collection any weekday.
I have enclosed copies of the receipt, the warranty, and both service reports. Please confirm in writing which remedy you are providing and the date it will happen. You can reach me at the phone number or email above.
Sincerely,
Marcus Bell
Enclosures: receipt, warranty, service reports 5512 and 6018
The template
Type your own details over the brackets. The .docx above carries this skeleton and the completed letter together.
[Address]
[Email] | [Phone]
[Date]
[Customer Relations / named person]
[Company]
[Company address]
Re: [Product or service, model and serial number, account or order number]
Dear [Customer Relations / Mr./Ms. Surname],
[What you bought, when, where, and for how much. Note the warranty or contract if one applies.]
[What went wrong, in date order. Then what you already did about it: calls, visits, repair attempts, reference numbers, and what you were told.]
[What you want: the specific remedy and amount, within a stated number of days of this letter. Add anything you will do, such as making the item available for collection.]
[Say what you have enclosed, and ask for written confirmation of the remedy and the date.]
Sincerely,
[Signature]
[Your Name]
Enclosures: [copies of receipt, warranty, reports]
Where to send it, and how
Address it to customer relations or to a named manager rather than a general inbox, and use the complaints address in the contract or on the company's site if it gives one. Send it by certified mail with return receipt requested, so you can prove it arrived and when. Keep a copy of the letter with the date you sent it.
Email is fine for a first approach and gives you an instant record, but a letter that will be quoted later is worth sending on paper as well. Whichever you use, send copies of your documents and keep the originals; you may need them for a card dispute or a court form later.
If they do not respond, escalate to the right place
A second letter to the same company rarely helps. Where you go next depends on what kind of problem it is:
- A wrong or unauthorized charge on your card. That is a billing dispute with the card issuer, not just a complaint to the seller, and it runs on a statutory clock. See the billing error dispute letter.
- Charges that kept coming after you cancelled. Cancel the authorization as well as the service, and tell your bank. See the cancellation letter guide.
- A bank, lender, card issuer, or debt collector. The Consumer Financial Protection Bureau takes complaints about financial products and sends them to the company for a response.
- A dishonest or deceptive business practice. Report it to the FTC at ReportFraud.ftc.gov. The FTC does not resolve individual disputes, but reports feed enforcement.
- Most other consumer problems. Your state attorney general or state consumer protection office, which often mediates directly with the business.
- The Better Business Bureau. Private mediation rather than a regulator, and worth a try because companies watch their profile there.
- Small claims court. The end of the ladder for a sum worth the filing fee. Your dated letter, the delivery receipt, and the missed deadline are the evidence.
Mention in the letter that you will take it further if you do not hear back by your date. State it as a plain next step, not a threat.
Is their reply any good?
A serious response names the cause, says what the company will do, gives a date, and offers a remedy without making you chase it. If the reply you get is an apology with no date and no remedy, it has not answered you, and the escalation ladder above is the next move. Our guide to the other side of this exchange, responding to a complaint letter, shows what a company is supposed to send back, which makes it easy to judge what landed in your inbox.
Complaint, claim, or demand letter?
The three overlap and people use them loosely. A complaint letter reports a problem and asks the company to put it right. A claim letter is a complaint that asks for a specific sum under a warranty, a policy, or a contract, so it is a complaint with the money named. A demand letter is the formal step before legal action, usually stating the amount, the deadline, and the intent to file. Start with the complaint letter on this page. If you need the money named and the clock running, the same letter with a firm sum and date does that work.
For the page layout itself, spacing, margins, and where each block sits, see formal letter formats.
Frequently asked questions
How long should a complaint letter be?
One page. Enough room for what you bought, what went wrong with dates, what you already tried, and what you want. Anything longer buries the request.
How long should I give the company to respond?
Fourteen days from the date of the letter for a typical consumer complaint, or thirty if they have to collect the item or inspect it. Put the actual number in the letter, so a missed deadline is a fact you can point to.
Should I send originals of my receipts?
No. Send copies and keep every original. You may need them for a card dispute, a regulator, or a small claims filing later.
Who should I address it to?
Customer relations, or a named manager if you can find one, at the complaints address given in your contract or on the company's site. A named recipient is harder to ignore than a general inbox.
What if the company ignores my letter?
Escalate rather than write again. Route it by problem type: the card issuer for a wrong charge, the CFPB for a financial product, ReportFraud.ftc.gov for a deceptive practice, your state attorney general for most other consumer problems, and small claims court if the amount justifies it.
Sources
- FTC consumer guidance on writing an effective complaint letter: identifying details including model and serial number, place and date of purchase, stating exactly what you want and how long you will wait, keeping the tone civil, sending copies rather than originals, and using certified mail with return receipt.
- Consumer complaint routing: CFPB for financial products, ReportFraud.ftc.gov for deceptive practices, state attorneys general and state consumer protection offices, BBB as private mediation, small claims court.
This page is general information about consumer complaints, not legal advice. For advice on your situation, consult a qualified professional.