sorry to hear about that. at least in CA i know you have a few days that you are actually able to return the call for a full refund as long as you don't exceed 300 miles i believe.

post the dealer's name so we all know who is not all that trustworthy.

if you really like the car, refinance. i used capitaloneauto.com a while back. they post their rates (very competitive) and approve it in minutes.