I've received two calls from this number in the past week.  I picked up today and spoke to a woman who claimed to be calling on behalf of the "_____ Cancer Foundation" (I didn't catch the first word).

I asked to be placed on their Do Not Contact list, and she said she would do so.  There was no hassle.

Call Display showed:
NAME = "DONOR DIRECT"
NUMBER = 780-328-6595

I did a bit of research and it seems that there is a Vancouver-based company called "Donor Direct" which does fundraising on behalf of charities.

"Donor Direct" has been on my missed calls 8 times in 3 weeks.  They don't leave a message.  I don't understand the stupid exemption for "charities" from the Do Not Call list...  I joined it because I don't want these stupid calls.  I'm blocking their number now.

The telephone # 780-328-6595 appears under Alberta Cancer, I am assuming that it is looking for donations of some type.  They never leave a message but they call frequently.