Did you pay a bond at the beginning of the tenancy? If so have you got it back?
If not, this hints at potential dodginess by the putative landlord.
It may also be worth asking them if they have declared the income to the Australian Tax Office. If there’s a hesitation or reticence to respond then consider reporting them to the ATO.
They like to get unpaid taxes back from dodgy landlords. And they laugh at delaying tactics.