When we receive faulty goods, or a product we have ordered does not arrive by the time set in the delivery terms, it might be time to sit down and write a complaint. The advantage of a written complaint over a telephone call is that the trader is more likely to take our grievance seriously and respond promptly. Furthermore, in the event of a dispute leading to legal action, your letter of complaint provides a dated document setting down the problem with the goods. It is therefore important to observe some guidelines on how to write letters of complaint.