Paint mega-disaster (long rant)
When I read the initial post I thought it was a joke.......sucks to see that it isn't
Make sure they have stopped any work on the car. They probably wont let you take your car out of the shop since you owe them $19,000.
The first invoice for $9,000 should have been a sign of things to come.....you need to figure out a settlement and get your car out of there.