I did a quick search, and it seems that the NC Lemon Law only covers NEW vehicles (not used), but you should definitely get some legal advice. Just do a search, as jorgelito suggested, for "NC Lemon Law," and it'll also bring up some attorneys that specialize in this, and most offer a free consultation to see if you have a case.
Here's an overview of the NC
Lemon Law, aka the New Motor Vehicles Warranty Act.
Good luck!!