No message left, presumed either Marketer of scam, destined for delete & block

Have had several calls the past week. When I answer nothing is said and then they hang up. Can’t call them back either.

Caller: Sushil Kumar

Sushil Kumar choudhary.911 @ gmail.com rang and pretended he was from NBN. He gained remote access to a computer and left his fingerprint behind (Email and password). He scammed the person out of $7.45 (an easy entry fee) before she woke up to what was happening and switched the computer off.
Upon looking at the computer there were around 4 remote PC applications and his email address and password. He had used the computer remotely to remote print all of the details on the computer and undertake quite a bit of internet banking and International transfers from the computer. Probably so there could be no trace to him doing it. #Checkmate #Dontf*ckwithnan

Spam

comes up a spam caller on my caller id - never leaves a message

Call multiply times but when I call back and message "Optus wishes to advise this number has been disconnected"

no message left.I called back and got the busy answering tone.
likely to be a marketer or scam

Called twice, no message left, probs some scam

Has called multiple times. Called back and got the busy answering tone.