A complaint letter may be written by a customer, a colleague, an employee etc to convey their problems to the concerned persons. A complaint letter can also be written for personal reasons. This letter if is to be sent to some business people should be written in proper format. Make sure to include some important points in your letter that are problem background, problem statement, desired solution, warning in case of serious problem and proper closing of the complaint letter. Try to be some polite while stating your problem.
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