I may not have used enough words, but you should not add yours either. Talking to someone should be the first step, not talking to their managers, parents, superiors, whatever.

If the situation is that bad, call the police, but that is an assault.

An example to back my "statement": https://www.gov.uk/how-to-resolve-neighbour-disputes/overvie... => 1.1.

It's also usually the logical thing adults do.