Received Call did not answer

Called When I was Asleep & Left No Message.
I've been on the "DO NOT CALL LIST" since 2005 (Just Verified last Week) and have never had a problem on my cell until about 1 mo. Ago.  I tried calling the # and it was DISCONNECTED...
SURPRISE, SURPRISE !

Called my cell phone. I did not answer.

No msg

Caller ID says "Sherman TX" no message left.  I don't know anyone from Sherman TX, blocked number