When that happens to me I just request a refund through Apple. I'm not waiting weeks for the in game support to do something. Actually, the last few times I contacted them, they just gave me the run around... You can request a refund through your itunes receipt email.
bump, these are still available, plus I have a lot of cars, so I may have what you are looking for if it's not listed. I've already made 3 deals outside of what's listed...