Calm Indian accent voice told me she's calling from Australia Cyber Security. Told me that my phone has been hacked and hackers can see everything I am doing on my phone. She knew my name.
I ended my conversation.

Don’t know anyone in Melbourne, so I didn’t answer call

I tried calling back and was told this number is not in service so promptly blocked it

Caller: Telemarketers

Flagged as spam - hung up when I answered so just be busy at the call centre

Don’t answer interstate numbers. They left no message. All = likely spam.

Received a missed call from this number after 6pm. I don't know any business in Melbourne that would be calling me after 6pm. I don't know anyone in Melbourne.
If it was a legitimate call from a legitimate company/person, they would have left a voice message.
After reading other posts, I blocked the number.

Caller: (03) 7048 3071

Indian scammer

Caller: no idea

seems to be a scammer

Called out of the blue, I declined the call as the phone registered it as a SPAM call; they never left a message or called back.

Said they were from Australian Research Centre. Could immediately tell I wasn't speaking to a real human so hanged up

Caller: Melbourne Number.

Rang twice and hung up before I could answer

Caller: Spam caller

Spam call go to call back and says the number you called isn’t in service

Called through and didn't leave a voice message. Must be a call centre.

Believe spam. No message left on my voice mail.

Caller: Telemarketer

Nonsense, hang up immediately