We have to listen to them and make them impressed by the time they are done lodging their complaint. We should make sure that we try hard to meet up to their expectations
I'm running a business and each time my customers make any complain all I do is to be quiet so I would advise you give them a listening ear. Allow them to express themselves and then you give them a solution and the solution you give should be to their satisfaction because your solution might not be their solution