Also have you tried autopay.com ? They are known for refinancing but they also do new purchases. They will shop your loan to a bunch of lenders and get you something. I used them before on a private party purchase on an exotic. Which most traditional banks didn’t want to touch, and I didn’t want to do it as an unsecured loan.
Here is the phone number for the Tesla Finance department. 650-681-6789. They aren’t great about answering the phone, but leave a message and they will call you back.
Did you get an email from a credit advisor at Tesla? Of all the folks I have interacted with, this credit guy has been the absolute best with all my little questions, and scenarios I wanted to see.