The question I have is what if there is a problem with all 7 series and they all do that? Perhaps that is why they are resisting giving another car because they realize that will not make the original poster happy. As someone who is considering a new 550 which is based on this same chassis, I am having serious second thoughts...add in the high pressure fuel pump issues and I hate to say it, but after 6 BMWs I might abandon them. On top of that the 550i GT has a 46% 2 year lease residual...they have no confidence in the future value of their cars, so why should I?
I wish the original poster the best of luck in getting this resolved...its a terrible situation.