I called back number (02) 5861 6161 rang 3 times then gets disconnected automatically.

I've missed a lot of calls from this number but sometimes I also answer and there's no one there. Today, I answered and didn't say anything before a man said "Hello?". When I replied with the same, he hung up.
Just some guy with too much time on his hands, I guess.

I missed a call from this number a few days ago. They called again, this time i answered. There was a bit of back ground noise, so I believe it was a call centre. There was a guy on the line, but not talking to me - either a colleague or on his personal phone - saying "I asked your sister, she told me all about it". American accent, but not that Filipino American. Assumedly donations or selling

Had a call from this number. Thouht the number looked stranged because the 58 prefix is not used in NSW. Tried calling the number back but the number doesn't exist.

I called back number (02) 5861 6161 rang twice then gets disconnected automatically.