I have been getting calls from this number. How do we block it??

Got called by this number over 20 times today.  It's still calling me after 10 minutes!!! Picked up and no answer. no message left. Who is this number????? $@#&!@!

This number called me this morning and I did not answer. I have received a call in the past from this number where I was pressured to donate and made to feel guilty about not donating. I asked to be placed on their do not call list which clearly did not happen.

It's basically a scam. Most of the money does not go to Charity at all. And some of it winds up lining the pockets of it's founder. Here's an article detailing the whole scam this guy is running from the Toronto Star. Makes me sick that they try to make you feel guilty about not helping kids when they have no intention of using your money to do that anyway.

http://www.thestar.com/News/Canada/article/273350

Received a call from them here in Saskatchewan this morning. Still scamming, I see. This time though it started as a recording. "Due to the..." (click - I hung up)

Got 17 calls from this number - called it back and it's the Children's Leukemian Foundation.

I received a HANG UP call from this number.  That only makes me NOT want to donate to their "charity".  Are they a legitimate charity?  I checked out the web site.  Very little info on the site.  I emailed them and said such calls are a total turn off.  Is it offshore telemarketers who have no manners?  Are they american telemarketers who are just plain rude?  the number on call display means nothing.  I have received other hang up calls and when i call back I get "this number is not in service".  How can that be?  the scammers are obviously smarter with technology than I am.  Or maybe i an just too honest and polite.