I called back number (03) 9977 7529 reached voice mail for a charity company but did not say the name.

Missed call. Called back, goes straight to recorded message along the lines of: “Hi there. Thank you for your call. If you’re calling to check on a missed call, this is where it originated. We’re calling on behalf of a charity you support, or may have supported in the past. We also call people to see if they’d like to support. If you no longer want to receive these calls, please email callingenquiries @ protophone.com.
This is an unattended call. Thank you and goodbye.”
Have received calls like this in the past, all they want is for you to email them so they can continue the scam.