Question: how not to deal with an angry customer?
Answer: Getting Defensive. One of the worst ways to calm a frustrated customer down is by trying to explain why something went wrong. ... 
Taking it Too Personally. ... 
Raising Your Voice. ... 
Ignoring Their Concerns. ... 
Showing Lack of Empathy. ... 
Being Slow to Respond. ... 
Acting Aloof. ... 
Not Asking for Feedback.