I got a message from this number saying it was the Australian Taxation Office and they are investigating me and my family. They have tried to contact me (from this number twice) and now consider it a fraud issue as I did not get back to them. Message sound American. I rang back on my mobile and it dropped out - rang from work LL and got 'your call could not be connected'....

I just had the same message, different number. Think it’s a scam.