Tax scam. This exert from the ATO:

We're receiving reports of scammers sending members of the public automated phone calls pretending to be from the ATO, as well as other government agencies including Services Australia and the Department of Legal Services. These automated calls claim their TFN has been suspended and that there is a legal case against their name. The call tells people they must contact the caller by pressing '1' or they will be referred to the court and arrested.

If the person presses '1' and makes contact with the scammer they are typically told that their TFN had been suspended due to money laundering or other suspicious or fraudulent activity and that there are several allegations against them. They're then asked to provide the last four digits of their TFN, address, date of birth, name of their bank account, and the approximate amount of money in the account/s. Sometimes the scammer will ‘transfer’ the victim to the ‘police’ where they're told a case has been filed against them and they will be arrested unless they pay. Sometimes they advise the victim will receive mail to their home or that their bank accounts will be closed.

If you receive this call hang up and do not provide the information requested. We will never send unsolicited pre-recorded messages to your phone or threaten you with immediate arrest.