They also want proof and without they will just close it. Since they are a BBB Accredited business, that stacks the deck against the OP.

One downside, it just makes the MB dealer want to do even less for the OP.

In another BMW forum, someone had an issue and BMW knew of his thread and it appears that BMW was a lot less willing to do anything for him. The OP should be building his case and talk to an attorney (the first consultations is free) and see what an attorney says and what the attorney says regarding his case. He also needs to see if he can get any additional information from MB prior to making them mad. Once you make them mad, they won't provide anything unless required under law.