Hey Lucian,
I have the same prolem (left rear subframe mount cracking). Same procedure with BMW SA amnesia. I did log a formal complaint which they promissed to follow up, but not expecting much.
Have you got contact details for your bro's panelbeating business. Any ideas what this would cost to get fixed ?. I need to get the car fixed so that the damage does not get worse, but will be sure to take some pics for use later. I will also get a BM dealer to visually inspect.
Cheers, Pierre
BTW, my car is a 328i (1999).....