Claimed to be from the Australian Cyber Security Centre. Number came up as being from Liverpool NSW. Claimed my number was being used simultaneously in two countries.

The Australian Cyber Security Centre (ACSC) is the Australian Government’s lead agency for cyber security, providing guidance, threat intelligence, and support to protect national digital infrastructure. They would have no interest in individuals. Their phone number is 1300 CYBER1 1300 292 371) and they are based in Canberra.