My son's truck was hit by an insured motorist in Nov. 2000 in Napa, California. Geico Insurance wrote a large check for the body work and the rental car and made it out to my son, but left it with the body shop. The car was not ready until Feb. 2001. The check should have been endorsed by my son but he never saw it. Geico faxed a copy of the cashed check, front and back and we see that the body shop forged his signature and deposited it in their account Dec 29, 2000. They paid part of the rental car bill with it but there is still an outstanding balance of $650. Sounds like a criminal offense to me...what should we do?