[name], one of our customers, called my office today to inform me that he had been treated in an extremely discourteous manner by you.
He was referring to a telephone call which took place on [date] wherein he claims that you stated that you were too busy to find the answer to his question at that time and you seemed totally indifferent to his problem.
This is, of course, completely against our policy, which is to make every attempt to please and keep our customers content. Without customers, we have no company.
I would like you to find the source of the problem in this account, call [name] with the information he has requested, and offer an apology.