The company’s insurance company will hire an attorney for your husband. Your personal attorney should oversee the representation.

Their status does not prevent them from suing. Yes, they can be required to attend trial.

Consult with an experienced criminal defense attorney.

Consult with an experienced attorney. Use the Avvo search tool to find an attorney. https://www.avvo.com/find-a-lawyer

You need to get a written agreement.

The repair shop can refuse release of the vehicle without payment. Check your state’s laws on automotive repair liens.

Consider filing a motion to set aside the judgment.

Insurance does not have to be involved. It is probably the car backing out fault as if your car is moving, you need to know of anything in your path.

You run a risk of a claim for misrepresentation which both states could have an issue. You might seek an official opinion.

You may be entitled to a partial refund.