I just got my car back from BMW, they clean the rust off the angle hinges and put some surface oil, WD-40 on it.
The service receipt said "Clean surface of seat Hinges" they are smart in that they did not say something dumb like "remedied or fixed" seat rust. Coz its not fixable.. i'll wait and see.
Secondly, they replaced my cracked B pillar trims. The tech did a shitty job as the panels are not even aligned properly... FCK