I called back number (07) 5512 8297 reached voicemail of a guy for a company called Wyndham Vacation Resorts.

This was a spam using the ATO and advising me that I had a case to answer re tax fraud. Seems they are using other company's numbers to hide behind. Of course no message was left.

It would be great if they left a message behind so that we know what the call is about. The often forget that people work and don't have time for their stories during the day.