I'm a bit confused here. Are you sure you are upside down $12,000 on what appears to be a $15,000 car? In other words, you owe $27,000 on this car????
Or are you saying you owe $12,000 on this car total?
If the former, how did this happen? Did you trade in another car that you owed money on to get the Audi? Is that how it was done?
Give us your numbers. How much do you owe on this loan, what's the interest rate if you know, and we can advise you better.
Also is this a Quattro? What's the mileage and condition?