Claim to be from National crime authority (NCA) but it is a scam. On the NCA website:

“From the Australian Federal Police: Be aware of suspicious phone calls saying they are from the National Crime Authority advising you owe money and a warrant will be issued if you don't pay. The AFP will never phone you making these threats — Hang up! It's a scam.

Current known scam calls:

Suspicious phone calls from mobile numbers saying they are advising that there is a tax debt outstanding and threataning to revoke the tax file number
"This is National Crime Check and there has been some illegal activity on your bank account"
"This is National Crime Check and you have provided the wrong ABN number and you are going to get arrested"