When mine broke, I had to pump the pedal 3-4 times to get the clutch to release. It would continue to work without pumping, as long as I remembered to hold the pedal slightly depressed (to keep the valve in the MC closed). If I released the pedal, then I would have to pump it up again.
I drove that way for many months, then finally replaced the pin.
But the obvious symptom is that it is impossible to adjust the slave free play to spec.
If you can move the shaft "up and down", then I think you have a different problem. Possibly the bushings are shot, or more likely the shaft broke.