Mystery Solved. These calls are NOT coming from The Heritage Foundation. They almost certainly originate from telemarketer The Heritage COMPANY. http://www.theheritagecompany.com/
I have been plagued with calls from this number & just called them back. It is the Heritage Foundation. The fellow I spoke with was very nice. I told him I'm on Social Insecurity & have no money to donate, would they please remove me from their calling list. He said they would do it right away.
They have called me before & after business hours but I do not pick up. Am adding this number to my Uverse call blocking list. I suggest you check with your phone or cell provider to see how they can help you block calls on their systems.
The lady that called said she was from the Heritage Company. We used to get calls from Youth Services asking for money. We have asked many times to take us off their list. They still call! Our company now is going to hang up on them. Very annoying and they won't leave us alone.