Caller: Claimed to be from nbn

Wanted to upgrade my service to fibre. (It already is) . Wanted to charge me $5.99 which I refused and hung up. Call originally came from (07) 4604 4469, After I hung up got calls purporting to be from (07) 4222 4580 and 0432 165 699 which I did not answer. They had my name and address which could have easily be found in the phone book. Made no mention of my carrier, which is suspicious as the carrier supplies the modem.