Never give donations to a stranger who calls you. Might be a scammer. Might be a legit independent fund raiser who keeps 99% for themselves and sends 1% to the charity. Best to donate directly to the charity so they will get 100% of your donation.
kept getting calls from them but no one was there when i picked up, called them and got a human and told them I'm on no-call list and to take my name off their list. Doubt it will work, but will see.