Looks like its been around for a while:
https://www.donotcall.gov.au/consume...bn-scam-alert/
NBN Scam Alert
Consumer Alert | 27 February 2019
Scammers are impersonating NBN to con victims out of their money and personal information
Have you had a robocall from the NBN warning your internet will be disconnected?
After being invited to press "1" or "2" for next steps, people are then prompted for their personal information or a payment to prevent their internet being disconnected.
NBN Co will never make these unsolicited calls to request payment or bank account details. If you get a call that you suspect is a scam, hang up.
Find out more about other types of NBN-related scams at
http://www.scamwatch.gov.au/news/wat...-for-nbn-scams
Learn about the ACMA’s role regulating telemarketing at
www.acma.gov.au/theACMA/scams-and-fraud