Engine mount bolt broke off in frame!!!!

[AirRepair]

Looking for advise.....
Recently took 2012 Malibu V6 to dealer for warranty water pump replacement.
During the repair the bolt holding the "snubber" (engine mount shock damper)
To the frame was cross threaded and snapped off in the frame.
Dealer contacted GM engineers and was told to replace that section of frame.
They told me that they would have to drop tranny n engine to do it and would have my car for 3 to 4 more weeks. They have already had it for 3 weeks.
Anyway it sounds serious and i am concerned for the integrity of my vehicle after having that extensive of tear down and reassembly.
Any thoughts would be great. What should i do?
Keep it, trade it?
What should dealer service center do for me?
If all this started with a simple water pump replacement how can i trust them with this repair?

[aleekat]

If you do decide to let them fix it. I would make sure to get some type of warranty IN writing of everything they removed and reinstalled.