Sticking to your pricing sometimes resolves things. I had a customer who would not learn what I explained to him each time he'd call. He'd push buttons while the macros were still firing, Comcast cable boxes were causing problems, etc.

He would never call me out for a service call, but wasted two hours of my time on the phone over many phone calls.

Finally on a Friday about 6:30 pm, he leaves a voice mail to come out because his housekeeper knocked over some equipment. By Sat morning, in his impatience, he hired a novice from another AV company for a service call.

Two weeks later, the kid is on the phone asking me how to change the programming on the remote. I told him if he has taken over the account, he should know how to program the remote.

Sometimes, cheap people waste your time. Identify when they are a harmful client and stick to your pricing. They will walk and you will be relieved.