Called me but left no message

called today, caller id shows as DIR ASST CA

Answered called no reply, then disconnect. Pest!

Caller I.D. said Dir Asst CA.  I did not pick up and no message left.

Called today and left no message, Now blocked although it won't do any good. It seems to me that ALL of these pesky calls started after I signed up for the national Do not call list. I now wish I would have never done this since I now have received almost 820 spam calls since 2014