I don't answer numbers I don't recognize.

I didn't pick up, as I did not recognize the number.  As our answering machine picked up, I heard a female voice say, "Hello, Donna?" (my name).  Then the caller hung up, no message was left on my machine.

Very aggressive,rude,won't stop calling at least twice a day even after multiple polite and some not so polite requests.Must be a scam as I cannot imagine a legitimate charity using such tactics.