We received annoying calls.

I just received a call from 415-632-1918. When I picked up, the other party hung up. I called back only to get a "number has been disconnected" message.

I received this call and answered.  No one was there.  I returned the call, and got a disconnected notice.  Obviously, they were not really calling from this number

REceived a call from above number.  Did not pick up, because it is an unknown number.  Did not leave a message.

I answered it and they claimed to be fro the Disabled Police Officers Association. These "Associations" are just scams anyway. If you ask them the name of their police officer representative they hang up. If I have the time I let the call go as long as possible, getting them right on the edge of obtaining my credit card number and then tell them "No, I was just intentionally wasting your time, like you have done to me."