I bought a used Model S about a month ago from a non-Tesla dealership. I established a Tesla online account. But I have had zero success figuring out how to add the car to my account. I have been to the tesla.com/support page about a hundred times, and I have filled out and sent a request for help there many times, but have not received a single reply from anyone at Tesla, and it seems impossible to speak to a live person on the phone at Tesla. Anyone who can help me with this?