I received a missed call from this number. Caller ID said it's from Campbell, CA. They left no message.

The guy told me that are doing some furnace cleaning.  I told him to put me onto the do-not-call list.  He said he has no power to do so.  So I asked to talk to his supervisor, and he said his supervisor will can call me again on Monday.  Lastly, I told him to ask his supervisor to never call me again, he respond, "I'll call you everyday.".  Best service ever received.