If you feel afraid for your safety, or they're being a public nuisance (noise, fighting etc - you'd know the bylaws there better than me) don't mess around mate - phone the police.
If it's not a police matter, I don't know what else to advise.
Whether or not its a police matter, maybe looking for somewhere else to stay, temporarily or permanently, needs to be a priority for you?
This has gone on long enough.
You can keep in contact with those you want to if you move, yeah?
D