With some of the pool owner's manuals I've read, if the vac head gets stuck on the bottom, it is recommended to shut off the pump. That should take care of any pole bending problems when trying to free the vac head.

A few questions.
Does your pool have a main drain?
Does your pool have 1 or 2 skimmer's?
What type of in ground pool is it? (Gunnite, Plaster, Vinyl, Tile, etc.)