I'm 99% sure that they have to give you your deposit back. I did on a 2005 GTO. It IS refundable despite what they will tell you. Simply go in and tell they you'll take it at MSRP or you'll take the full refund. Check your state's better business bureau or some other government source to know for sure before going in. Once you go in armed with the facts they will be much less likely to BS you. They were so nice to you in the beginning because they were making a FAT profit off you, not because they were such great guys.