I need to file a lawsuit against a company that sold my car without my permission or notice that they were going to sell it.

Its rare that a tow yard sells a car at auction and NEVER provides notice. In fact, that you were aware of the car being towed and in the lot shows that you were aware of the issue, so there is little reason for the tow yard to decive you. To the contrary, if you can't mak the payment to recover the vehicle, then their best bet is simply to track the law to the tee. At this point you will need to hire a lawyer to see if they complied with the notice requirements which involnes hiring a company to mail you notices at the registration address with DMV and go from there depending on the findings.