How do you pacify an irate customer / client?

The first thing an angry customer wants is to vent. To do so, they need someone to listen and, for better or worse, you are that person. Listening patiently can defuse a situation, as long as the customer feels acknowledged in his or her complaint. Hear them out.

Remain calm & dont take it personally. Use listening skills to find a solution to the problem. And apologize gracefully to the customer if needed.

First I have to know my customer what type of customer he/she is. Say for example she could be a controller customer they know what they want so the way that we assist them is giving them the exact solution without sugar coating it because they don't need that anymore. Second, as what I have explained above give them the resulotion that satisfies them. Lastly, make sure to ask anything they needed before letting them go make them feel we're doing something on their concern.