You need to know that it’s not a personal issue, but the customer is mad because of the product or the service you’re providing. So, control your anger and stay cool no matter how angry he became.
Be a Listener:
When someone faces a problem, he needs someone to vent out his issues. So, the first step to solve the problem is to listen carefully to every word he says and calm him down.
If the customer gets the feeling that you don’t care, he might get angrier. So, let him know how much you care and that you’d really love to give him a hand.
The more you care, the more he becomes calm and satisfy.
Solve and Apology:
Never let him leave without solving his problem. Also, you need to apology for that bad experience and promise that such issue will never repeated.
Don’t forget to follow up with him till he becomes totally satisfied.