There is a problem with these cars associated with the entire spring tower coming apart from the unibody. If that is what happened you ought to first report it to the NHTSA and then demand to speak to the MB regional service rep and havd them repair it. It's a known defect on this era W210 body.
I believe it is called a spring perch failure:
http://www.peachparts.com/shopforum/showthread.php?t=95120&highlight=w210+spring
Please follow up and let us know if this is the problem you experienced.