If mediation does not work, then an application for adjudication can be made to the NSW Consumer, Trader & Tenancy Tribunal (CTTT). It can issue a notice that the by-laws have been breached and then, if the breach continues, can impose a fine of up to $550 (in NSW). The owner of the property then gets that fine added to their quarterly levies, so they can’t avoid paying it.
Repeated breaches can lead to further fines but will require an ongoing effort by the executive committee and strata manager with further follow up action as ongoing breaches do not automatically generate ongoing fines
When going to the CTTT the overwhelming “rule of thumb” should be to seek appropriate advice, and seek it early and then follow that advice.