https://www.scamwatch.gov.au/news/watch-out-for-nbn-scams

People can protect themselves by following some tips:

If you’re ever in doubt about contact you’ve had from someone saying they’re from NBN trying to sell you an internet or phone service, hang up the phone and call your retail service provider to check if the person calling is a fraud.
You can only connect to the NBN network by purchasing a plan through a phone and internet service provider. Go to NBN’s website (link is external) to check if your home or business address is able to connect to the NBN network and see which phone and internet providers are available in your area.
Never give your personal, credit card or online account details over the phone unless you made the call and the phone number came from a trusted source.
Never give an unsolicited caller remote access to your computer.
If you think you have provided bank account or credit card details to a scammer, contact your bank or financial institution immediately.

People can also follow @Scamwatch_gov (link is external) on Twitter and subscribe to Scamwatch radar alerts to get up-to-date warnings.

a man with and Indian accent calling claiming to be from Telstra and stating that they are offering me a discount on my phone bill as my bill is too high. He then asks what was the amount of my bill. Obviously not from Telstra as they would know what the amount of my bill was. Told him I did not believe he was from Telstra. He ended up terminating the call.

Scammer pretending to be from Telstra

No one on the line, but they were so persistent they managed to de-synch my ADSL