EC will not act on noisy tenants

I live in a strata plan of 3 blocks each of 48 units. For the last year or so there has been a group of very noisy youths in one unit in my block. Noise = shouting, swearing and talking loudly on their balcony all night, coming home at 4am and being rowdy till 7 or 8am or longer, bottles being smashed on balcony, loud music, etc etc etc. The noise is evidently audible not just to our block but to those neighbouring, and nearby townhouses. I and others have complained in writing several times  to our EC, who appear to have taken no steps. They just say the owner of the unit does not care what happens in it. Recently we've been woken twice  before 6am by rowdy behaviour. I've rung the police but they do not attend. What can we do to get our EC to take some action?