Well to answer my own question, I just rang the number, it belongs to AAPT marketing. I have a internet / home phone bundle with them... I rang and spoke to the phone operator and requested I be removed from their marketing database.

I've been getting calls from this number for a couple of weeks now.  Same story...hangs up when I answer and get a recorded message when I call back.  I am an AAPT internet customer.

Same thing happening to me too - and im also an AAPT customeremily - there is no point blowing a whistle down the phone line - its a computer calling you not a real person - which is meant to connect you to a real person within 60 secs

I've had many calls over the past 2 weeks, but have never had a message left, neither on my mobile nor landline.
I've read the other comments, am an aapt customer with phone, internet& mobile bundled.Don't have broadband but aapt doesn't have it in our area.I can't see why they keep calling, as there doesn't seem to be a reason.
If they have a message they could easily send an email!

Hoping it will stop, otherwise I'll stop subscribing to them.

2 missed calls. Called back and says "the department you have called is closed"

Just got one today from this number and twice yesterday. I am a telstra phone customer and AAPT internet customer. Very annoying when they don't even speak to you or leave a message!