Recorded female voice speaking in Chinese. Upon calling the number back received the message "OPTUS regrets that the number you have dialled has been disconnected."

Caller: (02) 9056 7643

Female automated voice: "Please enter your activation code" then proceeded to give me the numbers before disconnecting. Happened twice within five minutes.

this number left an automated spammy message then hung up.

I rang back the number (02) 9056 7643 once but got disconnected

Called & left no message twice within 5 minutes. Called back twice & automatically hung up both times.

Did not leave a message & hung up 2x when I called the number back.