Comcast Customers - heed warning!
IT'S A SCAM!
If you call the number you will actually be talking to the crooks who want access to your computer, and may ask for your social security number and other info, and then they steal your personal information.
DO NOT CALL THAT NUMBER!
To view a video describing this attack, go to:
http://www.9news.com/videos/money/2015/03/24/70400118/