Yikes! This doesn't sound pretty, misgoodwrench.
You signed papers on a rig. Before you could get insurance and finance particulars hammered out and back to them...2 days later... they sold YOUR car out from under you? Then once you HAD a loan OKed to buy the original vehicle, you start getting cancelation notices and the dings against your credit history with the car sale rendered invalid by the actions of the dealer? Gotta admit, seems to me that there could be something illegal going on here. If nothing else, maybe you have recourse in the courts on being treated like this (if I understand correctly). 
An ascendant man, living in a degenerate age, MUST, by definition, live in contradistinction to his times.