I have been getting these calls too. Its a fundraising agency 2evolve they partner with different charities. If you email contacts @ 2evolve.com.au then someone will take you off the list.

I called back number (02) 9779 3504 reached voice mail for a company called 2 evolve.

She professed to be trying to get me to make regular donations to the Fred Hollows Foundation to which I have made one-off donations in the past. I think I may first see if the Foundation is aware of her doing this, i.e. if she is genuine.

They keep ringing every week or so but don't leave a message. I have called them back but they do not answer -just a recorded message. Don't like it!

Another lot that call about 2 to 3 times a day and you can hear the call cr noise in the background.