[pyaap]

Looks like you have all your bases covered so they should back down. If they don't ask for a print out of all the work they've done to the vehicle thus far, which you can use to support your case if you wish to initiate proceedings. If they refuse, any dealer will be able to provide you with the same. In the meanwhile, do make sure you have a pretty good idea of what replacement vehicle you would like (assuming its not a refund). When I went through this process, I was asked to make a then-and-there decision on exactly what I wanted because if it is going to be a factory build, they will be allocating a car which is very near production, which you will not be able to change the specs on once you've decided.