Hi I see you live in the UK.
Councils have anti social behaviour teams and have a duty if care to deal with
such issues.
Give your Council a call and start to keep a daily diary for evidence. If you can
record/video any of this on a mobile phone it will add to the evidence.
It does take a while to resolve as the Council need evidence rather than one
person’s word against another. The police probably only get involved if
a crime was commited like vandalism, or if it met certain criteria, for example
if it was racially aggravated.
I think they start with warnings to the person concerned.
If you live in a Council house and it gets too bad to stay in your home, the
Council can help to rehome you and give you priority.
If it’s a private landlord they may still be able to help you.
EVen if you live in your own house, they can still help. Take a look
at the nightmare neighbour next door TV programmes.
If your council does not help, you can report them to the
ombudsman. See this link.
Basically you don’t have to suffer, there is plenty of help available.
https://www.lgo.org.uk/make-a-compl.../neighbour-nuisance-and-anti-social-behaviour