poor workmanship

1997 dodge ram was taken in for diagnostics, had a small misfire. was told bad valve seat, estimate 950.00 just to take heads off and put back on with me getting heads repaired, took it back 3 weeks later to get fixed, new manager. was told 2000.00. told him I would think about it and call back. decided against it and went to pickup truck. they had it in the bay. someone had decided to check timing and now truck wouldn’t start. left key on all night and had a dead battery. here it is 4 weeks later and they still don’t  know why it won’t start. put my new battery in core bin and replaced with used  battery. they called, said it was ready. tried to drive it home but could only do 35mph without it shaking to bad to drive, throttle stuck open, almost hit another car. It shakes so bad you can’t drive it. can’t get postive respone from shop