I called back number (02) 8015 7731 rang once then goes to busy tone.

Be wary of (02) 8015 7731. It's a fax machine for a dodgy recruiting firm. Somehow they got my number or it was randomly selected, I've had about 6 calls in 2 days. Luckily I'm able to blacklist and auto-reject, but still annoying.

This number has called me multiple times over the last few days and when I ring back there is no answer!