I received a call from this number. It was an automated female voice (Australian) saying it was Centrelink and that I had not responded to letters and my case file had now been escalated to Canberra head office. It said press 1 to be connected and gave me an application number. When I pressed 1 nothing happened. When I hung up and immediately dialled back on the number that had called me 0456 077 905) it said the number was disconnected.