BTW - Charity Navigator is one place to check an organization. Organic Consumers Association has a 2-star rating on Charity Navigator. Another similar organization, for example, Center for Science in the Public Interest, has a 4-star.
Get calls from them all the time. I never answer, and they don't leave a message. Very annoying! I support what they are doing, but if I want to donate money, I know where to contact them. They don't need to hound me with calls every day.
I have gotten several calls from them. No one ever responds when you say hello, and no one leaves a message on the voice mail. My voice mail message even SAYS that "legitimate callers leave messages, so if you are not going to do so, do not call back or you will be reported to the FCC". Then I blocked the number, but they still call at least a couple of times a week. I have no idea what the point is of calling and not saying who you are, and not leaving a message.
Have been receiving multiple calls from this number daily for the past week. I don't pick up the calls because I didn't recognize the area code of number, and of course they never leave voice mails. So much for the 'do not call' list....
Unless the caller is trying to sell you goods or services, the Do Not Call list does not apply. However dead air calls like this can be reported to the FCC.