NHTSA Complaint #11498049 — 2021 CADILLAC ESCALADE ESV

Back in August of 2022 my 2021 Cadillac Escalade started having severe engine roughness, a check engine light, and an error saying that most of the collision safety features had been disabled. I was able to limp the vehicle into a GMC dealer who informed me that Cadillac had received a bad shipment of lifters and that one or more of the lifters had broken. When the vehicle detects an engine problem, it apparently disables most systems in the car. The GMC deal had the car for weeks trying to repair. They told me that Cadillac only authorized replacing 1/2 of the lifters. Since that time, the vehicle has continued to idle very rough ; the RPMs fluctuate and power surges at idle and while driving. I have been attempting to reach the Cadillac customer service people, am routinely told that I'll receive a call back "within 2 business days" but never receive a call back. Last week the vehicle died due to a problem with the automatic software update (it completely drained the vehicle). The Cadillac Rescue service jumped the battery and told me I had to take it to an actual Cadillac dealer and not the GMC dealer who had performed the initial repair. The vehicle had multiple errors including one that said the ABS system needed service. I took the vehicle into the dealer and they charged me for an oil change and 15k mile service. They said there was nothing wrong with the vehicle and that the 6.2L V8 engine was known for having engine roughness and surging problems. A few days later (last Saturday). the check engine light came on and we received a diagnostic text message saying that the engine and transmission required serviced within "1 day." We called the dealer, and they said to bring it in. I called them this morning and apparently they haven't even looked at it and suggest they will not do so until an appointment they created for 12/30!? Is this car safe to drive? Can I get it back?