Originally Posted by Team Plutonium
There is simply no way that anybody can claim that a minor impact like this could have resulted in the diff mount failure - a 10.9 bolt. That's is just laughable. OP needs to get a regional BMW NA supervisor involved.
Well obviously more than one sane person at an authorized BMW service center came this conclusion.
People get put on death row for less circumstantial evidence.
There's an easy/cheap way for this to get resolved (insurance claim). Or there is headache, frustration, wasting a lot of time, for a <10% probability of reversal by BMW.