Who called from 9713027255

Called and didn't say any thing. Could hear some clicking. Caller id said Security.

CALLED 3 TIMES TODAY JUST HANGS UP WHEN I ANSWER, WHEN I CALL BACK ITS BUSY

Telemarketer from H*ll. They keep calling - up to 13 times just today - and I when I start to say "Take us off --" they hang up. So.....if they hang up before I can say "Take us off your calling list" then it's okay to keep calling back? "National Enrollment Center" and "National Energy Center" are just a couple of the names.