So I've had my c63 w204 for a few weeks and all was good, until the other day I pulled off from being in slow traffic very light footedly and the car started lurching. At first it seemed like it was struggling to go into gear (2nd to 3rd) but then i figured out that 3rd was completely slipping.

So took it to an auto transmission garage where I had a service done on the box, hoping this would help....but it didn't. Codes read that transmission is slipping in 3rd gear which I kind of already knew.

failing this I took it back to the dealer where I bought it from, slipping the whole way there up to the point that the car decided that it no longer wanted to shift past 2nd gear(had to do several miles in second gear to get there). Even in manual mode it wouldn't change then when I got there it decided to lose reverse aswell!

Any one had these issues or had any experience with this?

car is a 2012 with mct

Your transmission is going into limp mode. Like BLKROKT said let the dealer figure it out. More information may help though, miles on the car, last fluid change, type of fluid used. What is the code exactly?