I returned a call from this number (03) 9115 7309 but no one answered the call

Got a missed call on my phone with the number. I called back and got a recorded message: The number you have dialled is not in use. The phone then hung up.

Caller: (03) 9115 7309

I called back and it said “number not in use”

called twice. I answered the second call and they hung up.

seems to be some kind of scam number now blocked

This number called me twice in one day. I've since blocked the number. No message left and I note my phone didn't even ring when the missed call message popped up

Caller: ‭(03) 9115 7309‬

Called 6 times, I answered 2 times but no response. No voicemails. What do I do?