Oh, Oh, Are you like really mechanically inclined?

MB's tend to want tender loving care or they will beat you up good!

They tend to create this slave to their own personal care!
Are you married? May need to go ahead and file for the divorce now, save the arguments!
"You love that damned car more than you do me!" OR
"Why don't you just sleep in the garage with that damned thing!"
Enough to drive you to

and then you can drive the MB to visit your kids on Sunday until they pull your license for the DUII's!
O.K., enough scaring ya, and spoofing????? They do get into your blood however and antibiotics won't help unless your dispensing them and then you can afford this little hobby! HA! Did you think this was just a car?? NO, it is a hobby!
Now, seriously, How did you turn it off when you got it home? If the outer part of the key cylinder is unhurt and they only butchered the core, your lucky. A new key and core is easy enough. But not really cheap. About $100.00 at MB. Go to the buy parts link above, if not in stock you could run a google search. Maybe about 50.00.
You may need to take it in if your not mechanically inclined and the car has Air Bags. You pop one of those and your cheap car is now way over priced!!!!!!!!!!