Ok so, I’ll attempt some ‘constructive’ advice…
Fighting fire with fire will only negate any claim you could make against them. And possibly heap more misery on your other neighbours.
If talking to them does not in any way work, then find out who the landlord is. Complaints against a property are recorded, and disputes can be recalled, if the property were to go onto the market. Landlords have to be responsible for their tenants’ behaviour, so have to act, if there is a serious problem. Anything that might potentially affect the value/potential sale of the property will be taken seriously, for sure.
You could of course have fun with psychological torture. I cannot reveal any details of possible actions you might try, as this might be a bit illegal. I’ll leave that to your imagination…
The trick is, not to be intimidated by anyone. Even if they appear threatening. Only yer proper nutters will actually do owt bad, in retaliation.
How old are you, and how old are they? I am currently experimenting with a ‘mosquito’ yute-repellent system; very high-frequency sound, played at very high volume, through loudspeakers. I’ve chosen a pulsed tone that I cannot hear, but youngsters can. So far, any groups of yutes making noise outside, have moved on within 5 minutes of me turning it on. Result! You could use such a system, really late at night, and it will drive them mad. It has the advantage that most people woon’t be able to hear it, so woon’t be able to back up any claims of harassment from them. You will risk upsetting any neighbours’ kids and pets, mind. A localised targetted system would be preferable; any communal ventilation systems?
Problem neighbours? Come to RudeBoy. I will make all their nightmares come true…
(BTW; I actually get on really well with all my neighbours, even miserable old Johnny (he’s not well). Some even give me plants)