Help needed on adaptations and statutory overcrowding

Hi, need some advice, Im disabled with two teenagers daughter 16 and son 13, we live in a one-bedroom basement flat, ive needed adaptations since 2015 unfortunately due to being overcrowding ive not been able to get these adaptations ( walk in shower, toilet and kitchen) I have 8 steep stairs to street level, ive been trying to move since 2015 but unfortunately I come 20+ I bidded for a property last week but my houisng association has said im number 8 even tho its a level access (which i need) they are saying its unsuitable due to the place has 14 steps, my position is they have left me in an unsuitable 1-bedroom with no washing facilities for over a decade. They are not taking into account that I can get disabled facilities grants for my medical needs. I understand my situation is complex due to my medical needs and statutory overcrowding but im being bypassed due to my disability.can anyone please help?