I see your frustration. Rather than suing the dealer for not being able to get the registration for the vehicle that you bought, perhaps advising the dealer that you intend to return the car for the full price paid might get better movement in getting your problem solved.One way to get some possible response is to go to your local motor vehicles department and get a dealer complaint form, fill it out and file it with your department of motor vehicles. This entity will look into your complaint and possibly get the matter resolved for you.