When we obtain a customer complain that mean our business have an opportunity to correct the immediate problem and restore goodwill. The first step that we should to apologize customer and record the problem occurred. We have to investigate what happen and why this problem occur and give a chance for staff to explain the fact. Then, analysis the problem and let the customer know how we discuss and what is our solving result. A simple explanation may be all that is needed. It should be customer expectation such as we offer them for free delivery fee on this requirement and give them next purchase special discount. Finally, make them a confidence and trust in over service by keeping them with the satisfaction.
In an addition, we should develop the sale procedure to make sure about there are not any problem will occur in the future.