Complaints

How to write a complaint letter that is easy to understand and answer

A useful complaint is specific: what happened, what evidence supports it, what has already been tried, and what reasonable outcome you want.

Reviewed 27 August 2026

A complaint becomes harder to resolve when the reader has to reconstruct the story from emotion, screenshots and unrelated history. You do not need to remove emotion from your experience, but the written complaint should make the facts and requested action easy to find.

Open with the purpose and reference

State the product, service, account, booking, claim or transaction and the relevant reference number. Then say what you are asking the recipient to review. Avoid a long background section before the reader knows what the letter is about.

Use a short chronology

Dates create structure. A three- to six-line chronology is often enough for the core complaint: purchase or event, first problem, first contact, response received, escalation, current position. If the history is long, attach a separate chronology rather than burying the request.

Distinguish facts from conclusions

“The invoice dated 4 June shows a second charge of $120” is a fact you can point to. “The business deliberately double-charged me” is a conclusion about intention. Use the strongest factual statement your evidence supports and avoid claims you cannot substantiate.

Refer to evidence without flooding the letter

Name the key attachments and what each proves. If you have a large file, use an index. The reader should be able to move from a sentence in your complaint to the supporting record quickly.

Ask for a specific outcome

A complaint that ends with “fix this” leaves room for misunderstanding. State the outcome you want: a written explanation, correction, refund, replacement, reconsideration, removal of a charge, updated record, or another concrete action. Whether you are entitled to that outcome is a separate question that may depend on the relevant rules.

Close with a response request and your records

Ask for a written response and, if appropriate, the complaint reference number. Keep the version you sent, all attachments and proof of delivery. If you escalate later, that record shows what the first recipient was asked to do.

Use the complaint letter builder for a factual first draft, then edit it so every statement is accurate for your situation.

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Finish with a verification check

• Have you preserved the original notice, form or transaction record?
• Can every important factual statement be traced to a document or dated note?
• Have you distinguished official deadlines from your own planning dates?
• Have you checked the current official route before submitting?
• Have you saved proof of what you sent and when?