Windows scam. They say that your computer's been invaded by a hacker, then give a number that they say is your computer. the number is 888dca60. They then tell you to open cmd, and type assoc (which is just file associations), the last one does indeed start with the number above, but, its the same on all windows computers, iow. big time scam. avoid.
Called 26 times between 12:30 & 3:29. June 2,2017. Have it printed out. Reported to Comcast, filing a harassment report. Called local PD on advice from comcast, for safety.