When debt collecting, make sure you don't go over-the-top when making threats to the debtor to press for payment.
Don't threaten legal sanctions like bankruptcy, visits from Sheriffs' Officers, seizure of assets, judgments, unless you have commenced legal proceedings. Don't threaten public disclosure of the debt to friends or the employer. Don't add exorbitant additional fees for late payment or every time you make a demand.
It is important to not unduly harass or coerce a debtor in these ways when pressing for payment. Otherwise you may fall foul of the Australian Consumer Law.