Caller: I don’t know. when I picked up, I didn’t say anything and did not hear anything from the caller either. The call was disconnected within few seconds. This number is a scam.

I am guessing there could be something the scammers is doing remotely to your phone by you just answering the phone. It is strange why they don’t talk and then suddenly hang up.

Scam, if you ring back (02) 3820 0581 you find there is no ringtone and the calls goes nowhere.