"How do I fix this ????"
If you have a normal "Crush Cage" on your steering column (which is what your drawing looks like) then the cage is welded to the steering column shaft and cannot be replaced as a sub-assembly - you have to replace the entire steering shaft.
Most of the VW service manuals tell you to replace the entire steering column, which is a good alternative in this case. Not cool, though, if you have a column color-matched to the interior.
However, if all you want is a new steering shaft and leave the existing column in place (because of color match to the interior or whatever), then:
You remove the steering wheel, remove the fastening hardware from the top (steering wheel side) of the coupler down at the steering box, disconnect the battery, Remove the circlip on the shaft just below the steering wheel, pop out the top bearing in the column, insert the ignition key and turn to "on" (to release the shaft anti-theft stop which will prevent the steering shaft from being removed) then grasp the steering shaft and pull it up and out of the column.
Be careful when the crush cage gets to the bottom of the steering column - just guide it into the bottom of the column tube and continue to slide the whole shaft up and out.
Replacement (after you get a newer, good one from a salvage yard) is the opposite process.
gn