A claim letter is used to express a complaint against a company by detailing an error or shortcoming. The letter should explain the issue tactfully without anger, provide necessary details to identify the claim such as dates and order numbers, and indicate any loss or inconvenience suffered. The letter should make a reasonable request for resolution but avoid accusatory or threatening language. There are three main types of claim letters: merchandise claims about incorrect or unsatisfactory orders; money claims regarding billing errors or payment disputes; and service claims concerning delays, discourtesy, or incomplete assistance.