This is a "spoofed" number. When you call back you either get a fast busy or a disconnected recording. They call me at least 3 times per day and now they have started calling with an "10" in front and the caller id states "INVALID NUMBER". I have never answered so I don't know what they are selling. Have blocked the numbers, but don't know if they can still get through if using a "spoofed" bogus number?