It's been less than a week since you made your purchase. If you have never taken possession of this vehicle, there is a chance you can negotiate with the dealership to rescind your deal. If they say no, get a lawyer, asap. Whatever you do, do not take possession of that unit until you see if you can rescind your deal. If you can't, your next choice would be to put it up for sale. You'll take a big financial hit, but at least you'll be able to salvage most of your investment.