I called back number 0401 131 489 rang 4 times then goes to busy tone.

bullsh*t survey about pensions how much you earn and how large is your mortgage

Aussie Choice called one of the phone numbers at my work about a cost of living survey. I have also received the same type of call on my home phone.
I don't give them the time of day, so I don't know what their end game is.
They seem to call from many different numbers, as can be seem from other comments on this site. Refer to (02) 9023 2009.