At many times there are complaints that need to be put in writing. Complaint letters are an effective way of expressing your dissatisfaction with a product or service. They give a clear picture of your problem. While writing a complaint letter always remember to include all the details of transaction in the letter. Describe your problem in detail and the step that you have taken from your side to resolve it. Don’t forget to thank the reader in the end as it will give him an impression of request and appreciation. Here is a sample formal complaint letter: From: Fatima Adam P45, Regal Apartments Pennsylvania To: Mr. Abraham Khan Customer Service Manager Alpha Zip Electronics Pennsylvania 19 th April, 2010. Ref: Formal Complaint Letter Dear Mr. Khan, I am writing to issue a complaint regarding a recent product purchase. On 12 th April, 2010 I purchased a Juicer Mixer Grinder with a serial no. 194582 and product model no. is D3906 from one of your outlets for the amount of $130....