The Mag Moss Act hasn't stopped many service managers from blacklisting your VIN and daring you to hire a lawyer.
Yeah, but if you do, and you go to court, AND you are right, not only will they have to pay to fix your car but also your costs and damages as well.
So, you just have to make sure you're right.
These guys are even happy to help.
http://www.yourlemonlawrights.com/The-Magnuson-Moss-Warranty-Act.aspx
Now this is interesting. We've got lawyers here in Phoenix that advertise on TV constantly wanting to sue someone for you if you've been in an accident. They even have catchy phases such as "Have a crash, need some cash?" and "Had a wreck, want a check?" Hadn't heard of one that specializes in car dealers. Might be worth keeping that link.