you should take the car and the bill to the dealer for some degree of reimbursement. Mercedes is fixing this problem at no cost to customers. I think the problem is that there is a pocket created where the spring perch is welded to the rest of the car where water, salt, etc., sits and causes corrosion. Seems to me that this is potentially a serious problem and merits a recall but the only way to get that is to inform the government. Raise a fuss with the factory representative and try to get some of your money back. Make sure the front end of the car is in alignment after this work.