Didnt take the call, but rang the number back and recorded message went like this: "Optus advise that the number you have called is disconnected".
It has been spoofed for the scam.....block....but of course they'll try another number next time. Just don't answer anything you don't recognise, if they don't leave a message, it is likely a scam.

Phone rang, answered it, and they hung up immediately. Probably a scam call.

Answered the call, said Hello twice - no response then they hung up

Rang back and recorded message said "you can buy this phone number. Go to" gave a website address.

Not in my contacts list. Blocked it.

Number not in my directory, did not answer, no message left. Rang back recorded message " Optus advises the number you have called has been disconnected". Probably a scam. Blocked.