Hi, I have a question about annoying cliets, who after perfect done job, when it comes the paying time they say " Oh, you missed one spot and I'm not quite satisfied from the service...". For my whole carеer in this business I had a couple of them and I didn't know how to treat with them. They do this only to get their discount of 10 or 20 % and this is really unpleasantly.

Do you have any suggestions how to deal with this kind of customers. I'll appreciate every advice. Thanks