dude, you really need to get yourself a legal advisor that will advise you on your legal rights and their legal obligations... i can perfectly understand the hardship, the difficulties that are encountered on this long issue - but at this point, they are simply taking you for a fool... this is where i draw a line - i am nice, but i am not a fool...

you need to show them that you got some teeth, and that you have a bite - they need to come up with REAL answers, or you will bite some heads off... your saga is well documented with the time stamps on this forum, i would think you got some additional documents in your posession - it is time to take them, if not to a court, at least to an ombudsman - are you a member of the BMW CCA? they do have legal representation for the members who have issues with BMW dealers or the corporate.