Unfixable?

I took my 2022 Hyundai Tucson hybrid in for service at the dealership and a software update "bricked" the whole car, according to the service manager. They've had my car for almost two months and still don't know how to fix it. They're replacing wiring harnesses, hybrid batteries, controllers etc, but still no success. How long should I wait before walking into the GM's office and get him/her involved. After this debacle, I don't trust the brand, and I think I want them to buy it back so I can get a Toyota or Mazda. How should I approach the GM and what is a reasonable ask?