On the second shot of the Rolleicord counter dial- left side, with the black circle- there are three teeth stripped away to the left side of the section without gears. With those teeth in place, after 12 the counter dial will rotate to the section without teeth, the pawl that drops into the metering dial slot and stops the wind mechanism has no place to drop, and the wind lever can freewheel and you wind off the roll. With the teeth stripped away, the mechanism plays Ground Hog Day and keeps winding, having the pawl drop and stop winding, again and again.
That could be what is going on, but I am not certain. Once the repair guy operates the camera with the side removed, he'll see where the problem is.