2.
Using gentle, polite letter. Not a show that you are a nice guy. Politeness is a deterrent for his anger. This will help you write a letter that is clear, accurate and understandable. As a result, it will be resolved as quickly and as pleasant. If you make him understand that you are a customer a reason. You are a customer, he will have to be maintained. He was even taken to improve the best. To the satisfaction of the people.