They say they are calling on behalf of Special Olympics. I make a donation yearly to SO and do not need them calling me to ask for more. I've blocked this number as well as 770-450-6217.
I called the number back and heard a pre-recorded message - sounds like a commercial call center that works for politicians and God knows what else. I any case, a very handy number to add to our call blocker box.
I exchanged a couple of emails with the Special Olympics and they confirmed that while they do conduct telephone solicitations, this is NOT one of the numbers they use. Calls from this one are not legitimate.