SMART said Potential Fraud - Didn't answer - No Message left - so as per my protocol it is now blocked.
Found comments here quite useful.

was some chick who could barely speak english. didnt hang around to see what she wanted. but reported as spam

Hung up

Caller: Unknown

Said they were from Telstra and were calling because they were getting alerts from my internet which needed to be fixed. I don't have my internet with Telstra. Scammers.

Caller: Telstra (alleged)

Cairns number. Said they were from Telstra and they wanted me to log into my internet to fix suspicious activity.
Ask them where they were ringing from and said Melbourne. When I questioned this he then said Brisbane. When I questioned this that he hung up.

Claiming to be Telstra offering 50% off my account for next 6 months

Received call, no message left on voicemail or text. Called number back and went straight to hang up tone and call ended. Assume scam.

Didn’t leave a message

called failed when phoning back

Unknown caller

This was the first of three interstate numbers that called me back to back this evening. None left a message. Likely to be a scammer.