Call a lawyer, you're getting run over by a fly by night repair company. Document everything, and if it's not worth your trouble get the screen back and don't those hacks touch it again. Report them to the Better buisnesss burea, if you even have anything like that in your area and start looking for a new TV, cause the one you have is never gonna be the same again.
My brother in law went through something similar though less dramatic with an plasma be bought, didn't get an extended warranty, ended up going to a local shop. The screen has been washed out since, completly useless if you ask me I couldn't stand looking at it at this point, it can never really be made right again.