Re: 2008 Transmission Control Module-After a complete engine replacement
Hmmm I agree the situation sounds fishy.
Is the extended warranty though GM? You might have more recourse if it is to escalate the issue.
What happened to the engine in the first place / are you the original owner? Depending on how much you have put into the car you may want to cut your losses, fix the issue and sell / trade in the vehicle.
Sorry I know this isn't super helpful advice but something to think about.
2008 Outlook XR FWD 255,000km
2009 Astra XR 90,000km