Caller ID reads "FOODFORTHEPOOR". They leave no message. Food for the Poor does do telemarketing (according to their website).
I call after hours (using *67 to block my number). I hear "No routes found. We're sorry your call can not be completed at this time. Please, hang up and try your call again later. Thank You" Then it hangs up.
So they don't seem to be able to be called back. Smells like a SCAM.
If you are inclined to give to Food for the Poor, check out their website and do it that way rather than through a telemarketing call. That way 100% of your donation goes to them and not a scammer or at best a hired-gun telemarketer who annoys you and will take a likely substantial chunk of your donation.