What if you steal your own car back?

Let it go.

I know the legal theory. I also know that it would take an attorney so expensive for you to pull that off that you might just as well not hire him - and buy a $10,000 to $15,000 replacement car with the money saved.

You agreed to pay the car people, and you didn't. It may not have been your fault, but it sure as heck wasn't their fault. They have it back now, which was their right.

It's over. Just let it go.