Who called from 7746704435

Already over 13 calls from this phone number, when I answer it just beeps, don't know how to put a stop on caller

5 calls within mins of each other... I didn't answer the first 4x since I don't know anything from Worcester, MA
I just answered the 5th call... when I answered it just beeps.  So annoyed!!!

ber keepscalling me all day !!! why cant we stop this !!! I work nights and sleep days

11/11/15- 5 calls this AM , sounds like a fax but could be some kind of data gathering program

How do we get these calls to stop?  Totally annoyed to say the least.