A hard-copy complaint letter should be written in the business letter format, while an email should be sent in the same format but without the heading (your return address, their address, and the date).
Complaint Letter Writing
In the first paragraph you should identify what the issue is and any relevant information that you believe is important. Be sure to include the following information if it's applicable to the situation: the date/time of the issue, location, name of person on duty, name of product, what the problem was, your account number, model number, price, warranty information and reference number. Be sure to stick with the facts and avoid putting emotions into your letter.
The next paragraph should state what you would like done to resolve the situation. If you received poor service, you could request an apology or a coupon. If a product malfunctioned, you could request that you could exchange the product for a new one or request a refund.
The last paragraph should thank the reader for the time. You can also throw in some compliments about something you liked about their company's product or service.
You should include your telephone number/e-mail address after your printed name so that they can contact you ASAP if necessary.
Be sure to keep a copy of the letter for yourself and include photocopies of any relevant documents and enclose them with your letter.
Also see: Sample Complaint Letter
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