What should you do if customer complains?

One of the most important things to do is to listen to what the customer is saying. Try not to take the complaint personally or listen too much to the 'tone' of voice as sometimes customers can be a bit aggressive and rude. Stay calm and positive enough to think clearly and help the customer. Be sure to apologize sincerely (even if it wasn't your fault) and do you best to rectify the problem.

If you do not have the authority to solve the problem yourself, inform your supervisor and act on the complaint as soon as you can. Make sure that the customer is aware of your efforts to rectify the problem and apologize again.

Remember, everyone makes mistakes and it is best to think of a few ideas of how to solve such problems in the future.

Prevention is better than cure so be sure to learn for your mistakes and not let them happen again.