This is a tricky question that has probably gone hand in hand with customer service from the beginning: When a client gets angry, starts yelling and behaving in an almost aggressive manner, what should the company rep do?
On the one hand, the “customer is always right” rule applies, but on the other, you can't tolerate offensive behaviour on the part of the customer.
Here are several pieces of advice on how you should behave if the client starts yelling at you.