A sales letter is used in much customer-producer relationship. For example, a sales letter can be used for promotion of product or even to offer a service for the currently malfunctioning product. A sample sales letter for customer service can be seen below. Keep a sales letter short and brief.
Address of client.
Dear client name,
We heard from you that you are having problems with our product that you purchased last month. We, from this company, offer always good quality products with good service life.
As our product caused inconvenience, our company offers you a free service in order to make sure that everything is working in order and you are satisfied with it. Soon, a officer will be at your doors to take care of our product.
For additional information, you can call us at our customer service desk or visit our website.