They call but hang up when answering machine answers

I called back number (02) 9112 3746 reached IVR for a charity company called Kids Cancer Project.

Starlight foundation call centre

Ring & hang up when hearing answering machine

I called back number (02) 9112 3746 reached voice mail for a charity company called Kids Cancer Project.

This call hangs up when answered. It is from Contact Centres Australia and on this occasion calling on behalf of Kids' Cancer Project raising money for Childhood cancers. When you call back there is a spiel about Kids' Cancer Project and a number you can dial to make a donation or to have your name removed from the list. The number is 1300 655 041

I called back number (02) 9112 3746 reached IVR for a company called Kids Cancer Project.

Don`t know who this is, but they hung up when the answering machine answered just like with the previous people, Pretty sure it`s a debt collector, just get that feeling

They ring but hang up when they hear my answering machine.