I called back number (02) 4302 5836 reached voice mail but did not say for what company.

Got a couple of missed calls from (02) 4302 5836! Left no voicemail! I called back with just a answer machine and didn't say what company they were

Received a call from this number on Tuesday 26/09/17 as well as today 29/09/17... Decided to call back and went straight to voicemail with the person stating "... all of our agents are busy right now, please leave your name and number and we'll get back to you" with no mention of what business it was!!!