If you give good response to customer complaint then you will receive complaint only once.
Complaints are good as it gives an opportunity to learn and not to repeat such issues. It enables you to improve the customer experience. The information from the complaint can be used to build a better customer experience and convert the unhappy customers into the happy ones.
Being customer focused would help in understanding the situation of the customer. This would help the customer to be calm and polite and not getting frustrated. If the employee truly focuses and understands the customer issue, then the customer would at least feel that he is being heard and understood.
Also it is important to work on the issue reported and take proper action to resolve it. It is good to first to know what would make the customer happy. Once they put up their suggestions, verify if that could be provided. Resolve the issues quickly as possible. If an upset customer comes up with an issue and if the issue is resolved very quickly, then he would much likely be happy for the service.
Provide a tool to employees for handling customer service well. At times, there can be no option to make the unhappy customer satisfied. Such cases can be transferred to the manager or the supervisor.
Enable employees to handle customer service complaints efficiently, quickly and professionally.