You might breach Commonwealth consumer protection laws if, in communicating with a third party, you:
suggest or imply that the third party is liable for the debt when that person has no legal obligation to pay
suggest or imply that the third party should try and persuade the debtor to pay the debt, or that the third party should themselves pay the debt
put pressure on the debtor indirectly by involving the third party
embarrass or distress the debtor.