Start your letter with something positive in order to soften the blow of your complaint and so that the company or entity will be more willing to work with you. For example, if writing to complain about a faulty product that you purchased, you might begin, ‘I have been a loyal customer of your store for many years.’ Mention some of the positive aspects of the company or organization, such as the overall quality of the products or services, the low prices, the excellent customer service, and so forth.
Open the next paragraph with a sentence that begins to allude to the problem. For instance, you might write, ‘It is understandable that companies that offer a wide variety of electronic products would occasionally come across a faulty piece of merchandise.’ Then, in the next sentence, state your complaint. (Again, if you intend to do more than just complain and want the problem to be solved, it is best to remain professional and courteous. Do not sound accusatory or demanding.) After clearly stating your complaint, indicate what you would like to have done to rectify the situation, if anything. You may want to mention, also, the actions you will take if your complaint is not answered or the problem is not solved.
In the last paragraph, mention that you would like to continue to use the company's products or services, or to continue to be a customer of the store, or a member of the organization, or a viewer of the TV station. Then, suggest why it is in the other party's best interest to grant your request: you might mention the importance of maintaining a good reputation or keeping you as a customer, or you might appeal to their sense of justice. In other words, give them a positive reason to want to resolve the concern. As you close your letter, express confidence that your complaint will be taken care of. Finally, thank the company or other entity for handling your complaint.