Lifeline service problems

I have a lifeline service and my dongle holder was broken and for two years I kept asking about getting a replacement because mine was broken! Anyway I found out that if the dongle is broken including straps that it must be fixed within 24 hours or quicker. Well in September last year I got burgled and assaulted and things were made worse because I didn’t have my dongle with me, it was impossible! Where do I stand and can I sue my housing association for not fixing the dongle covering/strap in the time permitted! I was told by the lifeline engineer that there are even 4 hour slots where things must be fixed within 4 hours but two years and more is one massive joke! I have other serious issues that I need help with because I need to move, I’m scared and don’t ever go out any more, I have brain tumours as well as spinal cord tumours and my recent MRI scan shows new damage in two places! I can’t sleep at night and I’m not coping at all!