To the OP: a story to consider: I know a guy.....had a serious problem with his newly purchased new Chevrolet Suburban. Worked with the dealer for 3 weeks, no progress (of any sort) certainly no resolution to the problem. So the guy sent an attorney letter to the dealer and voila! problem resolved in 2 days.
So the guy was me, and yes I'm a lawyer. Lawyers can be expensive, but I suspect you can find one that will a) take your case if what you've presented here is the complete story; and b) likely write a pretty good letter for under $250....a lot of money you say? Might just get the dealer to resolve your problem quickly rather than stringing you along as they have so far. Even if the State AG or your jurisdiction's version of Consumer Affairs ultimately resolves the case, those two agencies will loom much larger to the dealership if those agencies are to be informed/brought in by an attorney.
Free advice worth what you pay for it, but if you don't get a positive response from the dealer on first request and don't get problems fixed within a very reasonable time frame, I'd get an attorney involved. It's not the horror situation that is hinted at on here.