I told them to find a new installer. After a lack of respect from them. 6am text where just rude

I've actually gone through this!!

Clueless instructors messing with the equipment and blowing up my phone because it is an emergency at 6:30am. Special event and given an hours notice to please come "fix" the system.
I've dropped in on their two locations so much I offered them a service plan and they said since they paid so much money and it never worked right why should they pay.

I stopped responding.

Update

Last Thursday I told him you bought the mic it didn't work. I got you a guy to come last Saturday to bring a new mic. It didn't work. Find your own mic guy.

The gym owner calls me from a random number so I would pick up. Asks can we have a sit down and work thru the problem. I said yes. I will be there tomorrow at 10am.

1 hour later calls me mad. He loses his temper. I said you have 2 options.

1. I come take my gear and send you a check for what you gave me next week.

2. You understand I charged you to install a dsp and 2 vol controls. Understand another company will charge way more and take the remaining $500 you owe me and get someone else.

I get a text I hired someone else. It works fine. He charged me $400. Which means he saved at least $100. But is now ask me to pay that guys bill. When he still owes me $500.

Some people!