Without getting into the details, I've been asked for advice from someone who (8 months ago) rented an item from party A, however had a small accident. Party A told my friend to pay the excess and they would claim the remainder from insurance (party B). From what I understand, party B then passed on the full amount to a debt collector (party C). The debt collector initially contacted my friend and wanted the full amount paid to them. My friend called party A who advised them not to pay them anything as it is sorted, and from their experience the debt collector will keep trying. Several months later a new rep from Party C ( debt collectors) are hassling my friend now. Seems they pass on the job periodically or something. Anyway what formal action (if any) can my friend take to to stop this harassment? With the police? Or the Office of Fair Trading QLD? Or more scary is whether they have a leg to stand on here?