Im on the Do Not Call Registry and they keep calling me.  They call between 6 and 7pm PST.  I answered and they hung up, so I called them back and I got a voice mail for Donor  Business Services, claiming office hours were 9 - 5pm, and i could leave a msg.... Then no beep to be able to leave a msg!  It was 7pm when they called me... Yet they closed atleast 2 hours earlier, if they are on the west coast!

Received a call from this number. Answered and they hung up.

Received a call four days out of the last six this week from this number.  I haven't tried answering and they never leave a message.

Its a "Donor services" for charities. Call them back and tell them to cut you off. They will- probably.