Victoria's ambulance service has announced a sweeping review of its debt collection processes after being accused of "unethically" pursuing homeless people and "good Samaritans" for unpaid transportation costs.

Ambulance Victoria has also revealed that its debt collectors will stop pursuing patient debts by using contact information from triple-0 calls.

The announcement comes after several people contacted the ABC, complaining that they had unfairly been chased by debt collectors on behalf of the ambulance service.

Ambulance Victoria's chief executive Tony Walker said the service had made changes to its debt collection practices.

"I want to reassure the community that if they dial triple-0 today, they can be absolutely confident that their number will not be accessed by us or passed to a third party for the purpose of billing," Mr Walker said.

"Through this process change, the community can be confident that they will never receive an invoice for assisting someone else in need."

Mr Walker also announced that Ambulance Victoria would commission an independent review of its "debt recovery and management processes".

Ambulance Victoria has apologised to Jenna. ( ABC News: Madeleine Morris )

On Thursday, the ABC revealed that the debt collection agency, Australian Receivables Limited was pursuing a "good Samaritan" who had used her mobile phone to call an ambulance for a homeless person.

Jenna, who didn't want her surname published, was on her way to work when she saw a man get hit by a car.

She told ABC Radio Melbourne that the victim, named Will, was in pain but was too afraid to go to hospital.

A few months later, she was contacted at home and on her mobile phone by the debt collection agency.

"I heard this really strange message about calling a debt collection agency Australian Receivables Limited and I thought that's really odd," she said.

"About an hour later my mobile rang and it was Australian Receivables Limited and they wanted to talk to me about an invoice that was due to Ambulance Victoria."

Privacy concerns

She said it was "unethical and outrageous" to chase a homeless person for medical debts.

She was also worried that it was a breach of privacy for Ambulance Victoria to pass her details on.

"I feel homeless people shouldn't be charged for ambulance call outs and I don't think good Samaritans or passers-by should be followed up and their private details should be shared."

Ambulance Victoria has since apologised.

David was annoyed to be contacted by the debt collection agency. ( ABC News: Matthew Neal )

In another complaint, David, from Warrnambool in Victoria's south-west, was left feeling "confused and anxious" after being contacted by debt collectors chasing ambulance costs, after his wife suffered a leg fracture.

The couple have private health insurance which has full ambulance cover, and David said those details were given to the paramedics.

"What irks me the most is hearing about it first from a private debt collection agency — or what appears to be a debt collection agency — rather than from Ambulance Victoria themselves," he said.

Ambulance Victoria is investigating that case and says anyone who believes they have been followed up by one of its debt collection agencies in error should ring 1800 990 029.