I responded by answering the call from (02) 6228 3327 and immediately received an auto-recording in an Asian language.
I will, myself, block this number, but I would be interested to know if by answering the call, this may regardless alerted the caller's system that my mobile phone was active and could use it in some way down the track.

I answered the call, an Asian lady (or possibly voice recording) started speaking straightaway. I have blocked this number but also wondered if it has triggered some sort of tracking or placed me on a pain-in-the-butt callback list. Annoying