Should try calling one of those consumer complaint groups that the local news outlets have. They seem to be able to get answers and action better than individuals can. In the Bay Area here we have a couple:
https://abc7news.com/7onyourside/
https://www.nbcbayarea.com/investigations/consumer/
Can also try getting in touch with the executives. True story, this last iPhone cycle my trade-in got lost somewhere along the way and Apple wanted me to pay for it. Wrestled with customer service for a long time with no luck. Fed up, I sent an email directly to Tim Cook explaining the whole thing and he actually took care of it. Couldn’t believe it lol guy is my hero now. I have to imagine that if he cares about a customer with a $1500 phone, somebody over at BMW will care about you and your $100k car.