They have 30 days to respond to your complaint in writing otherwise you may take matters to Office of the Australian Information Commissioner who will determine if they can investigate your matter on your behalf which is free. If so, you may be entitled to non economic loss costs award depending on the circumstances. As you are a tenant you are not listed on the strata roll and all real estate agents are subject to privacy laws. You may have a claim against 2 parties at best and at worst its just another beat up. Just remember some strata managers operate on the pricipals of laissez faire as do many strata plans.
More info here
https://www.oaic.gov.au/individuals/what-can-i-complain-about