Seems like a hoax caller claiming to be from the australian taxation office. I blocked the number as i did not believe that the ato uses robots to call people up to tell them about tax matters.

Called me and wanted to varify the details and asked TFN, Bank Detials. I disagree to provide and called bac few minutes afer to this number. He claimed to be ATO and asked me what is the concerrn and when referred about his page that you are HOAX, discontinued the conversation.

Caller: Some Richard Cranium

Claims to be the Australian Tax Office. Surely this isn't getting any responses from anyone.