Perhaps the hook in the end of the wire became snagged in the hose interior rather than the sock. Ensure that the wire is free to move in and out smoothly.
Try twisting the wire after the sock is snagged as you pull it to clear any obstacle in the air pipe.
It is highly unlikely anything could become jammed in a straight tube with a smooth interior.
A broom stick pushed from the thin end toward the widest end should also be able to dislodge most any obstacle in a vacuum cleaner hose.
EDIT The pieces can be separated. According to the user manual, the three parts—extension wand, floor nozzle, and hose assembly—should be disassembled to remove blockages. That's on "Troubleshooting" for possible causes for low suction on page #9 of the User Manual.
As the wand halves telescope in and out, try to alternately extend and retract them to get better positioning for removing the problem.
Wish your Grandpa Good Luck