2016 Chevrolet Corvette Engine problems

I left my car at Vandergriff Chevrolet in Arlington, TX for diagnosis and repair of a transmission sensor failure. They took nearly 6 weeks to fix the issue. When I went to pick up the car, there was a new noise in the engine so I left the vehicle for diagnosis. Now, they are telling me it's a known issue that is considered 'crucial' to repair but is not a recall and they are so far unwilling to cover the repair since it seems to have happened while they had the vehicle. I've attached their service bulletin indicating the known issue and repair.

At 627 miles took to dealer, transmission was slow shifting from 1st to 2nd gear. Dealer reprogrammed transmission. At 2319 miles took to dealer. Transmission shudders at steady speed on highway or going up slight incline. Dealer flushed and changed transmission fluid to remedy problem. Customer charged $576. Car was manufactured with incorrect transmission fluid for the 8 speed automatic transmission application. Temporary complaint #cln19-56809

2016 Chevrolet corvette z06. Constituent stated that the vehicle was sold to them with a lien from previous owner. They also stated that the vehicle has engine issues. *Ld *js

It has a strong smell of gas and is leaking from the top of the fuel tank. Strong smell of gas when parked in garage and also when driving and stopped. This has been happening for a while but has gotten worse.

Right rear time cracked multiple times and supercharger rattle at lowes speeds

Car overheating when used in high performance driving, alarm sounds and goes into limp mode. Happens within 10 miles of 30 rapid accelerations.