Since this affects common property which is presumably being damaged by the delay, you, the strata committee or strata manager could seek interim orders requiring access from NCAT. Interim orders do not require mediation first and can be heard within seven days.
Have a look at this page on the NCAT website then, if you want to proceed, fill in this form (which must be posted – you can’t apply for interim orders online).
Occupier means resident, in the above context.