This document provides guidance on writing effective complaint letters. It discusses common reasons for complaints in business including poor quality goods, late or damaged deliveries, incorrect orders, and poor service. When writing a complaint letter, it is important to remain courteous and factual while clearly explaining the problem and your requested resolution. The letter should include relevant details like order dates, quantities, and specifics of the issue. It should make a polite but firm request for prompt correction while avoiding accusations or rude language. An appropriately written complaint letter can help get the problem resolved to the satisfaction of both parties.