I advise against waiting, too. I'm not trying to get you riled up against them but you've been exceedingly patient and the law is there to protect you from this kind of unfortunate occurrence. An attorney becomes your spokesperson so you can finally sleep at night without wondering when you are going to call, who you need to call, what needs to be said, etc. I'm not saying you need to go off on someone half-cocked and start threatening to sue or anything, but getting a spokesperson to act on your behalf and get some action (and likely get you resolution via your state's Lemon Law protections) and if it's for less than a few hundred bucks for an hour of an attorney's time vs. how much is *your* time worth?
It reminds me of the time my wife took her bug into the dealership to have an A/C repair estimate and a tech broke the hood latch handle and just set it on the pin. She got home and I went to check everything out because I'm not particularly trusting of dealerships. When I tried to pop the hood, the latch came off in my hand! My wife went back to the service dept. the next day and they tried to tell her their tech would never break something without saying anything because they have some policy that they'd replace it, then the service manager got involved, then after he basically called my wife a liar to her face I called the general manager and had a long talk with him. But the bottom line of the whole event was that with all the techs, supervisors, managers, my wife, and myself standing around and on the phone this particular VW dealership was wasting hundreds of dollars of labor per hour just to deal with a 10 dollar part. I have the luxury of wasting my own time as I see fit, but most sane people do not and will not. Sometimes these dealerships will beat you into the ground for no rhyme or reason.
In any case, I just hope you don't waste too much of your energy, time, and money on this issue because I think you've allowed for a resolution far beyond what they could reasonably expect.