WHOA... insane...
I do think both parties are at fault. I would never have paintwork done on my car without knowing and SEEING some examples of their capability. And the price should have been a big indicator.
However, the company should have known they were incapable. Despicable. Grabber screw body kit install? Good hell.
Honestly Maaco would have done a better job, and probably cheaper too.
Poor guys.