How do you you handle an irate customer?

Offer any and all support that you are able to give to the customer. If the customer continues to be irate ask them if they would like to speak to management. If they refuse and the solution to the problem is out of your hands politely state that management would be more able to help them fix the problem. Do not under any circumstances let the customer push you to make any unprofessional remarks that may endanger your employment.