a good shop will stand behind their work, a bad shop tells you to get lost.
This has always been my experience also, but was he talking about actually messing up the back window, and not the tint? Either way it shouldn't be a problem with a good shop.
Steven Oliver
2004 GTP comp-g WS6. Gator and suede all around interior.
Advanced MECP certified installer, custom upholsterer.