Mercedes-Benz C200 Gearbox & Transmission Problems

If it has a dipstick it can, but you'll find your car doesn't. Automatic transmissions these days are so-called "filled for life", which means they're filled with fluid at the factory and there should be no need to regular checks or top-ups. If you want to change the fluid, which can be a good idea, you need to go to an auto trans specialist.

Your frustration is understandable. I would urge you to go back to Mercedes-Benz direct and request some assistance with the cost of repairs. While I doubt that Mercedes would cover the whole cost of the job, I would think they might cover part of the cost if you approach them in a reasonable way. If you don't want to go down that path consult an automatic transmission specialist and get another quote for repairs.

It’s the gearbox and it’s badly in need of some TLC. Take it to a transmission specialist and have it checked.