Sullivan Buick GMC Trucks

I had a terrible experience at Sullivan Pontiac. The replaced the front cradle assembly, left some bolts loose. I complained about a clunking sound, took service mgr for a ride and he said it was normal. We took a trip to the Rockies and it got worse, took it to a dealer and they found that the bolts on the stering were ready to fall out, said it could be very dangerous situation. Sullivan could not even find a problem. Several other problems also that they were never able to fix. Contacted Pontiac to no avail. Sullivans is terrible. We have had 14 pontiacs over the years but this is our last one, last GM also.