Several calls, no message.

Received call from this number with no message left. Very annoying. Caller ID said "Not available."

same exact thing for me, today and yesterday.

Several calls each day no message.

I spoke with the caller and the caller indicated that the company supplies energy to PEPCO.  Caller also indicated that I would incur a fifty dollar penalty each month if I did not address the issue.  I honestly did not understand the issue.