That mechanic sounds like a really crappy guy and i would stop going there completely. How does a window, that is in his shop, breaking your fault.

201 wrote So 3 months ago the CD player in my car breaks, I take it to the mechanic to have it fixed and they claimed taking it out completely was the fix. I send my car in 3 weeks ago for 2 new tires and an alignment and they break my window and charge me for it and claimed they didn't do it. My moms car goes in to have the heat fixed, it gets fixed and now it broke less than a week later. It got fixed today and they charged her for it again and now she's arguing with them. Who's wrong?

In legal terms the mechanic is wrong and has to reimburse you for the windows.

However around your mothers car this is a typical thing that mechanics do. They will fix the thing in such a way that you have to come back and get it repaired again or change for a different part which would cost less. With your CD player you should have just took it out and put a new one in. Plenty of tutorials out there.