Bruce,
Sorry to hear that you didn't get all of the cars you thought you were getting. However, as was already stated, every transaction, TCA or not, is buyer beware. It appears that you didn't take down the seller's name either, so I'm not sure how you expect to find him. No disrespect intended, but instead of expecting someone to fix this, you might be better off just chalking it up as a learning experience. We've all made deals where we didn't feel good about the outcome. It falls under the heading of "live and learn."
Good luck!