So the dealer principle has posted a video that he made of his own car and titled it "More rattles" and he swears that they don't have problems with rattles. I think he may be in for a bollocking for that one.
This is where the beauty of the internet comes into it's own. It gives people like you a platform to publicise your dissatisfaction in the product and the way you are being treated. Get as much publicity as you can for this. I'll pass it on to Z4-forum.