No message left so I have no idea who this is.

annoying pushy bastard

No idea who this caller is, no message and when I have tried to call back, no answer! Very annoying!!!

Same here, rings for 10 secs then stops.  I answered once and there was silence on the other end.  Just had 3 consecutive calls between 6:05 pm and 6:15 pm.  You know, dinner time.  I suspect it's Optus, yet I don't have any fixed contracts with them.

I have the answer you all seek.  It is a charity organization called TLC for kids.  They are a genuine Melbourne based charity, who provide assistance to disadvantaged children.  I have been donating a small amount a couple of times a year, for many years.  This is a genuine charity, providing tax deductable receipts etc.

We are on the "do not call" list - we are a doctor's surgery for urgent medical attention. Callers like this clog up emergency services!