Left no message.  Caller ID from San Fransico

We got a call from this number today at 3:46 pm and didn't answer. The caller ID was INCOMING CALL. No voice mail message was left. Our caller ID by default is blocked for outgoing calls, so I called back. I heard a recording stating that I had reached the automated opt-out services to be removed from their telemarketing calling list. This is clearly a violation of the law because we are on the National Do Not Call List (which has proven to be ineffective). This number will be added to our call blocker.

09/15/14
Caller ID read Incoming Call 415-803-8011 this evening. Did not pick up. No message left.

Received call from this number in the afternoon.  It hang up as soon as I picked up the phone.  Called ID stated it's a call from San Fran.

no message left on recorder called at almost 8p.  usually means telemarketer or scam.