How would you respond to an angry client?

The way I would deal with am angry client is to first off realize that the customer is not mad at me personally and to not take it personally. I'm a firm believer in the customer comes first so what I would do in this scenario is that I would listen to the concerns and complaints of the client, apologize for any inconvenience and said situation might have caused the client and work to offer a solution that will best satisfy the customer. Showing the client that you're willing to listen to their concerns proves to them that Boostability and its employees can handle any adversity that comes their way.