I went out shopping this morning to a homeware (wholesale type) shop. I am a full time wheelchair user and had my carer with me. We wandered around for a while and I then said I wanted to use the toilet. There are two toilets, 1 male and 1 female. Both are large and are fitted with pull cord alarms and pull down safety bars. I am able to go to the toilet myself so my carer waited outside.
After I'd used the toilet I pulled the bar down to enable me to stand to pull my trousers up, and the whole thing pulled out of the wall onto the floor. I am unable to stand on my own, and if it wasn't for the fact that my wheelchair was in front of me I would have landed on the floor. As it was I ended up hand sprawled across the chair and half off it.
I leant over and pulled the alarm cord which then came away from the ceiling and ended up on the floor. Luckily it still rang though. I could hear the alarm going off through the door and my carer asked if I could open the door as they couldn't get in (I'd locked it). The room wasn't too big so I was able to manoeuvre to the door to open it.
When I did there was a member of staff there who proceeded to talk with me whilst the toilet door was wide open into the entrance/exit. It wasn't until I asked if I could shut the door as my trousers were still around my legs that she realised. She just kept saying 'we've had it ages and it has never happened before'.
I was really shaken (still am really), as even if you have a medical condition meaning you can't walk you still don't expect to fall. I am sore and tender now.
The staff member obviously spoke to the manager as she came and found me and apologised and got me a drink.
AIBU in wanting to write to them to tell them what happened? 
The screws holding the bar on the wall (which is supposed to be able to take body weight) were really short, and it was a plaster board wall too. My carer took pics so I can send them photo's of the rail and screws so they can see. God forbid something like this happen to someone else, the outcome could have been a lot more serious.