when i answered they just hung up

Missed call. No message left. Probably spam. Rang back with my number blocked and got engaged signal.

Caller: (02) 9071 0239

Assumed as spam. I don’t answer calls that don’t show their identity. No voicemail left.

Caller: Unknown. they didn’t speak once I picked up

Called me several times. When I finally picked up no one was on the other side

Caller: I don’t know

Probably a scam call. No voicemail

rang and didnt leave a message.

This number rang me and because I didn't recognise it I didn't answer as I am getting a lot of scam calls. They could have left a message on my voicemail but they did not.