If one has correct amount of toe and wheel is not level at straight ahead position, then the guy did not set the wheel to straight ahead when he adjusted toe.
A simple remedy is to lenghten one tie rod and shorten the other both the SAME amount . [ count turns]. This changes where the SW is in relation to the tire angle without changeing the toe.. Do this until steering wheel is straight.
The direction of adjustment is dependent on if the wheel is not centered right or left. You can usually see that by centering the SW and then see which direction the tires are starting their turn [ right/left]
Most shops don't know that many Benz have a lock on the steering box that can be engaged before alignment to assure straight ahead position before setting toe.