According to NAB's web page - the caller ID can be spoofed (fake).

LATEST SECURITY ALERTS
November 2022: NAB-branded SMS phishing and calls
We’re aware of a current scam impacting NAB customers, where they receive phone calls and text messages pretending to be from NAB. These calls and messages might appear to come from NAB’s phone numbers, or in the same thread as legitimate messages from NAB.

This is called ‘spoofing’, where the scammer uses software to ‘spoof’ (or copy) the NAB number or sender name so that it appears in your phone as coming from NAB. Spoofing – or caller line identification overstamping – allows the cybercriminal to make the caller ID or SMS sender name show something different to what’s really being used.

The scammer will claim they are from NAB and there is an issue with your accounts, and that your money has to be transferred to a new account to keep it safe.

This is not a sign that NAB systems have been breached in any way– it simply means a criminal has spoofed our number and is impersonating us. Please see two examples below.

Not a scam. It's nab fraud assist

Caller: NAB Fraud Assist

Not a Scam it is NAB, I rang the Direct Number to NAB to verify, it was legit, had someone fraudulently use my credit card, so we cancelled it and they issued a new card. So many scammers out there, ring the bank direct and and follow through for peace of mind.

Caller: NAB

It's NAB, I made some changes to my account and it was a follow-up call.

Caller: Fraud

I can verify that this number is a fraud. Nab Fraud assis number is: 1300 622 372. This person tried to inquire about my bank details and personal information. I wonder why cant a police complaint be lodge against this fraud?

Caller: NAB Fraud Assist

I setup a new Mobile & tried to transfer funds. NAB blocked my access as they thought it was fraud. Called number & seems legit. Best to go into Bank if you're unsure. I didn't give them any info but it's safe to call to listen to the NAB Fraud options (all is transparent & legit).

Caller: NAB Fraud Assist - (03) 7003 5052

This is NOT a scam number. It is NAB Fraud assist. My account was locked. Two minutes later they called and after several identifying questions they unlocked the account.

Caller: NAB

Impeccable experience at its finest~

A polite Nab officer called to confirm if I made PayID to BOQ Bank and Macquarie Bank. I wish anyone who works on weekend strikes lottery, good luck, and good life.

Cheers~

Caller: NAB Fraud Assist - (03) 7003 5052

This actually isn't a scam number. It legitimately is NAB Fraud assist, called me to verify changes I made to a recipient bank account before they released the large payment I had scheduled. I work in finance - I verified them, they verified my, all above board.

Caller: (03) 7003 5052

Called me in regards to a debit card I had blocked due to him scamming me. Tried convincing me he was from NAB and that the new card is compromised too and needed details to “block” it. Scammer

Yes this is a scam

Bewrae This is a hacker impersonating NAB . Do not repsond with personal information

Scam artist linked to crypto scam through binance and then hack you’re Instagram to trick the next person into it

Caller: Someone impersonating NAB employee

Do not give them any information.
They are very convincing and try to get information out of you

Caller: Scammers

Try to trick you into allowing remote access on your pc