Does the key start the car? If so the door locks can probably be initialized. There are two separate functions to a key with remote. The remote function can be learned/initialized without special equipment. The ability to start the car is programmed into the key by MB and is not repairable or programmable in the field OR DEALER. It works or it is junk!
The cluster can be had rebuilt here:
http://www.beckmanntechnologies.com/ They don't show the 210 on their site but I'm pretty sure they do them.