Bedroom tax stripping us of much-needed benefits - help needed

I'm parent  carer of a young adult with autism . Im particularly worried about the future as my son gets older and finances get tighter and tighter , as bedroom tax continues to strip us of much needed benefits . We can't afford to pay for my son to have help to get out  and we've had to get rid of tv. Yet the two bedrooms in question can barely fit a bed into them . Is there anyone that can legally help us ,re has legal aid all but gone ? Only we think the rooms may not be viable as two bedrooms . We asked landlord for them to be made into one room as my son has to put all his wardrobe and belongings in one small room and the bed in the other,  yet this was refused. Who can we go to for help if at all please  ?