Damn did I get screwed, my own fault though

If you get any problems with the power windows not working, check the "bulhead connector" that connects to the doors. My grandma's pass side went out and the shop charged her $600 to fix it...

A month later the driver's side did the same thing for another $600...

My mechanic friend told me that there is a problem with the wiring harness connectors and you have to clean them up and it will fix the problem....

Grandma got taken...