Homeless people sleeping and using drungs in the communial area

Hi, I am resident at flat 52 Vince Court Charles Square N1 6HN , we always get people who is homeless sleeping on the strairs in the communal area, they can be verbally agresive, I responded 3 weeks ago to the police, this issue is keep happening we don’t feel safe going to our flat, very scared of beening attached by homeless people, most of the use drugs, alcohol and may others things, we would like the door keys to be changed for the front door as many of them break in by the firebugate key, I also would like the building to be more-secured by a cct cammera for the flat. This morning there was 2 men injectining drugs on the stair’s, I feel very worried going’s down the stairs as a women, can you please act on this before something happing to a resindents in this flat. If you are not going to take actions I am planing to write to Hackney MP , I can’t keep reporting issues to the police. Please do something.