It's the Red Cross. Sometimes I was getting 2 phone calls a day. I finally called back and asked to be taken off the calling list. Hopefully that will take care of the situation.
I have never answered it but I just got 5 calls from them in a matter of 2 minutes. It could be the Red Cross. I have donated blood to them many times. Not sure why they're calling so much like this though. They don't leave messages.