This number calls repeatedly, usually 3 to 5 calls within a ten minute period, 2 to 3 times a day, as late as 10:45. When I called back, i usually got a beeping sound. Finally, I got a message saying that this was a non-working number that HAD belonged to Blue Shield of California. Obviously, someone has spoofed the number and is using it to make harassing calls. We're on the National Do Not Call list, and I'm reporting this to the FCC.