Wsp in wow about acc violation real or fake??

We don't usually threaten that we'll suspend you if you don't visit a non-blizzard related website, Zeronight. That person was attempting to trick you into giving up your account information.

You can always tell a Blizzard Employee by the Blizz icon that is in front of their name.

http://us.blizzard.com/support/article.xml?locale=en_US&articleId=30829

If you receive a whisper like that right click on the chat line and select Report Spam.