Unique Problem. I have a 2020 Model 3 Performance that's 38 months old. Out of warranty with 86K miles. Came out to leave for work and Vehicle is dead. car will not unlock from key card nor app. Tesla Home Charge cable will not unlock, but strangely I can manage the charging with the app. Thinking it's the 12V battery. I has Tesla roadside assist me with the links to get the frunk open to pull the battery out. Did so and went (in my spare vehicle) to Tesla to purchase a new 12V battery. Came back and installed and STILL have issue. Tesla Roadside can not get out to me house to try to open vehicle or disengage charge cable for 3 days. I'm sure it has to be towed but need the charged cable disconnected. Bluetooth will not connect to the vehicle. Both access cards do nothing. Car is a vegetable. What might my problem be?