You think American cars are unreliable and you bought a VW? For the year of your Jetta:
Yet again, you have become overly defensive when I ask a simple question. Moreover, I'm tired of your libel (I've also noticed that you've posted it on another message board).
I have never raved about any dealership, nor am I affiliated with any dealership.
You asked for a recommendation and I gave you one.
You asked for an opinion of a letter, and I gave one.
Here's my advice. It is obvious that your Jetta is a lemon (OR was improperly maintained before you bought it). Move on in whichever way is the least expensive. If you can get VW to cover it by continued nagging, or through a lawsuit, then do so. If you can fix it all yourself, then do so.
Either way, once the car is running and/or covered, sell it and buy a Honda or Toyota. You can easily get the $9k you owe on it, probably even via trade-in.