Not quite sure if this is a scam.  Caller ID simply shows the phone # - no company/organization name.  Asked for Bill - told them there was no one here by that name.  Asked the name of the company they were looking for.   Mentioned would like to talk to the person who handles charitable donations.  Told them no Bill and they have a wrong no.  A legitimate non-profit will say who they are and the org. name.  So many crooks and so many devious ways to try and con the public !!!!!!!!!!!!!!!!!!!!