Keep quiet by counting quietly in your heart how many seconds/ minutes customer make noise. Once they realize they're the only noise around, they'll feel embarrassed.

1. Don’t Take It Personally Although angry customers take their frustration out on you, they know that you did not cause their problem. Allow them to vent about their problem, but do not take it personally. Listen to their story without interrupting and then find a way to help. 2. Never Argue Back It is natural for upset customers to express their anger, but some customers can take things too far and your reaction may be to defend yourself. However, as a professional customer service specialist, you should never argue back. Maintain your integrity and be the better person. If customers begin to abuse you verbally, let them know that you understand their frustration and that being rude will not solve their problem. Let the customer know that you are there to help, but you cannot do so until they calm down.