I understand where you're coming from. If someone does want to donate to a charity, make sure you do it as anonymously as possible! Never provide any kind of legitimate contact information or they will hound you like a swarm of mosquitoes.
I ran into this problem with Habitat for Humanity. Before Caller ID and when answering machines recorded on tape, a caller would call every day at about the same time and hang up at a point where my answering machine would run the tape to the end with nothing on it, preventing any legitimate callers from leaving a message. One day I was home from work early and at the time of the mystery calls the phone rang - it was Habitat for Humanity who I had donated to just a couple of weeks earlier. I made it clear that their calls were unwelcome, and lo and behold the "mystery calls" stopped.
NEVER give any charity your contact information! They will hound you day in and day out!
When I came home tonight, which is Sunday, this same number and name 202-495-7181 (AICR)was on my caller ID. First I Googled the phone number and that's where I found this site. Then I Googled the name American Institute for Cancer Research (AICR). There were several sites that talked about them. Below is a website that researched then did a report on AICR. Should help answer some questions.
Have received calls from AICR {American Institute for Cancer Research} for the past couple months. Tonight I got one from "Unknown" {same old 1-202 495-7181 number}. Don't know if they think this will make me more apt to pick up, but this only makes it more likely I will never answer. If I don't recognize the number or name I take the position, "If it's someone important, they'll leave a message". I always check a few moments later and 99% of the time they do not!