It seems to me that you should seek immediate professional legal advice!
But I do see that NCAT has an “Urgent applications” system that can be heard within 1 to 7 days:
http://www.ncat.nsw.gov.au/Pages/cc/Applications/ccd_urgent_applications.aspx
http://www.ncat.nsw.gov.au/Documents/ccd_form_strata_interim_orders_application.pdf
This is to obtain “interim orders”. Eg that the works must stop until they are approved.