Same here, they keep calling me, even when I stated multiple times I can't donate. I looked up the Do Not Call list rules and saw that registered charities are exempt. The only way to stop them from calling you is to request to be on there internal DNC list.

They are really aggressive! They call like three or four times a day when we are not available (at work).

This displayed as Unknown Name so I called back intending to ask to speak to "Unknown Name" but a recording said it was the Childhood Cancer and that if I wanted to donate I should...
I put the 'phone down.

Me too. Made the mistake of donating to Childhood Cancer 2 years ago. Still receiving donation requests. This is what you get when you donate.

Childhood Cancer should be proud; they have a lofty goal.  Why are they doing this?  I am really sick of these stealth calls.  If Childhood Cancer thinks it's good practice to hide behind "(416) 849-4468" as a Call ID, then I will prove them wrong:  I have stopped answering their calls!

Keep getting calls from this number even though I have registered with the "Do Not Call List".  I wish they would stop.  I do not answer these calls any more.