Caller: They claim to be from the NBN

They want your information so they can get into your computer. They do this by getting you to press certain keys. I think it's all about ransoming your computer.

Caller: Robo Call claiming to be Telstra

Automated message claiming to Telstra who will disconnect NBN in one hour if you do not select 1 for a technician - SCAM

This company called about my website domain that I no longer have and tried to market their services to me about a website design and asked me for payment. Block it at all cost!!!

Caller: Scam Call & Information

If you get this call, do not pick up. This is a scam call, they will ask you for your details pretending your local bank or any other service you are with.

Had a missed call. Trying to return call gets 'Call Failed' on my iPhone.
Probably another time-waster.

Very odd number and not even going to answer.. probably spam

Same as above - rang once and then beep, beep, beep

I called back number (03) 7020 5650 rang once then gets disconnected automatically.