2006 Envoy XL SLE Rear Windshield

Hey everyone, I recently bought a 2006 Envoy XL with about 55k miles. I opened the rear hatch window the other day and had trouble closing it; when I looked up I saw that the passenger side hinge was no longer attached to the glass. It looked like the adhesive had melted, it was stretching. I called the local GMC service center and it is not something they would work on, they send out glass work to safelite and other auto glass places in the area. I called safelite (and will stop by tomorrow) and they sounded as if this was out of their league also. Does this sound familiar to anyone, any advice?
Thanks in advance.

Has your concern been addressed? Please feel free to keep me posted. You can also contact me via private message. Thank you.

Tricia, GM Customer Service.

Remove the glass hatch and hinges.
Try Gorilla glue for minor repair.