Question: how to deal with an angry customer in retail?
Answer: Get Them In Private. Here we're not talking about your average customer who is a bit ticked off or simply rude. ... 
Let Them Get It All Out. The most important rule to successfully diffusing the situation is to let the customer say what he or she has to say first. ... 
Listen. ... 
Kill Them With Kindness. ... 
Follow Up. ... 
Conclusion.