I've had the opportunity to scroll through my Caller ID and spotted this unknown number from March 9, 2017:  301-917-4459 Edwards, Nikol.  A Google search didn't turn up anyone with that name.  A spoof number, perhaps?

Got a call from this number, again, and someone identifying themselves as "Nikol Edwards" on Thursday, March 30, 2017 at 7:02 PM.  They started asking me if I had received any mailings about Medicare.  I mentioned Medicare.gov and hung up.