To assist you in finding appropriate consumer advice, please try the helpful links below. –
These links provide information to State authorities whom act as “Building Code Police”

Victorian Building Authority (VBA):
https://www.vba.gov.au  
https://www.vba.gov.au/disputes-and-resolutions
Domestic Building Dispute Resolution Victoria     https://www.dbdrv.voc.gov.au

NSW Office of Fair Trading:  
https://www.fairtrading.nsw.gov.au 

Queensland Building and Construction Commission (QBCC):
https://www.qbcc.qld.gov.au/

South Australian Building Commission:  
https://www.saplanningcommission.sa.gov.au/scap
https://www.sa.gov.au/topics/business-and-trade/licensing/building-and-trade/building-work-contractor-s-licence

Western Australia Building Commission:
https://www.commerce.wa.gov.au/building-commission/  

Tasmanian Consumer, Building & Occupational Services (CBOS) :  
https://www.justice.tas.gov.au/building