I should add that if you don’t want to start a war with (rather than in) your block, you could take action against the upstairs neighbours directly. This however tends to descend into “he said, she said” although it can lead to a more immediate resolution.
Once again, I find myself advising Flatchatters to speak to StrataAnswers who will advise you on your best course of action for a modest fee, before escalating it to a strata lawyer, which may also be necessary. In the meatime look here and here for information about applying to NCAT for orders.