Before you start throwing around phrases such as "I don't understand how this is legal", remember how YOU got into this situation.
If you are saying that it is illegal for a company to sell you a car if you have a suspended license. Don't you think that it is probably illegal for you to buy one on a suspended license? So I would probably not use that argument in court or you will get a nice 30 minute lecture from the judge on personal responsibility, although that may not be a bad thing in your case.
However, there are other items that may be in your favor. There is the statute of limitations, where they only have a certain amount of time to file a suit against you. So not knowing what happened in the 13 years, such as if you made any payments or not. You may actually have not owed the debt.
But since you said "I can not afford to pay the debt that I have set up with the current lawyers assisting the Credit Acceptance Corp." It sounds like you may have reset the Statute of Limitations thus making the suit legal again. This is something that you need to look into and paying a lawyer a couple hundred dollars may save you this $22,000.