2011 Mercedes C-300 service B indicator reset

2011 not under warranty, the dealer should do it complimentary. however, i will give it another shot, you do have the up-down arrows, and can change the screen to the wrench yes?

if not, have the screen set to the odometer reading, notice on the right of the steering wheel the call button, and on the left side the ok/enter button...with that turn the key to position one, then at the same time, hold down the receive call and ok button together,the menu will change, go down to ASSYST PLUS, hit ok, go down to FULL SERVICE, go again to CONFIRM FULL SERVICE, hit ok, go down to yes. and done, if this isnt available, message me...

when I do this, the only thing that comes up is reset the trip meter? My Mercedes is a 2012 c 300. Suggestions?