Unknown call received with an on-screen "Suspected Spam" warning. So I blocked it without answering. Searched reverse.au but number not yet listed.

A man called me and does not clearly speak, he mumbles and wanted to know if I was the person he had phoned. I asked him what he was calling about and he would not say. He then said it was of grave concern and wanted me to confirm who he was talking to. I would not confirm I kept asking why he was calling. He then called me an idiot. I then hung up on him. Do not answer this call. He is obviously a scammer.