The pressure plate can freeze to the flywheel, but this means the clutch pedal works but the clutch does not disengage from the engine, so you can not get into gear.
So if the thing has been bled by pumping the clutch pedal we might assume the master cyl is working OK.
Is the clutch slave pushrod correctly adjusted?
Is the piston in the slave cylinder seized?
If you remove the pushrod from the cross shaft lever and gently push the pedal a small way does the piston at the slave cyl move? Worst that can happen is the piston drops out and you will need to re-bleed. Get a friend to help.
With the push rod at the slave cyl removed can you get any movement on the cross shaft lever by hand (in either direction) It should go toward the slave cyl a bit.
If both are doing the right thing I fear its box out time and look at what is happening with the clutch cover