Really sorry to hear about your predicament let's not go over how you got to it or whose at fault.

When you do call or meet the seller, I really hope that you can convince them to give you back some of the cash. After all, you did pay them upfront with no questions whatsoever so they should show some delicadeza if they have any.

Anyhow, if they don't and the situation becomes real ugly I suggest that you sell the car nalang before it drains you more or worse, breaks down rendering it useless. At least you can still get some cash back and erase the object of frustration out of your garage.