Who called from 2011830626

It's a scam.  Here ya go-  http://www.snopes.com/fraud/telephone/microsoft.asp

This # kept calling and when you called back they won't answer to you then they hang up.

Called at 9:15 PM.  I answered with "who is this?".  Human voice replied "hello-hello-hello".  It was definitely young male voice!  I hung up....annoying!