I called back number (02) 8058 5898 reached IVR for a company called Insurance Australia Group.

I don't know this number. Like other people have stated in their comments in this list, I think this particular number could also be a scammer. I've found that almost all the Sydney based numbers that come through to me are from ppl who claim to be trying to find information about something I've bought or they are from a company trying to get my interest in something they are doing, selling etc.

NRM Insurance