Telemarketer. If you callback, it automatically goes to a call centre:
"Thank you for calling the property investment hotline"

I too am on the do not call register, have never given this company my number and they called me from 0410 824 114 originally, but after I blocked that number, they started calling on 0410 836 340 instead. Take a hint, I'm not interested, should be fined for harrassment.

Property investment hotline.

Investment/tax saving call - caller asked for previous company director from 5+ years ago

Property Investment hotline - goes to call centre.

Got a missed call from 0410 836 340 and there was no voicemail left.
Upon calling back the call was directed straight to a recorded message saying "thank you for calling the property investment hotline. "
I have never given my number to anybody regarding property and I am registered on the DO NOT CALL REGISTER. Very disappointed!