Stuck Character

I am actually Stuck in Icecrown (dead and mounted), I cannot move at all neither with the mouse (left click + right click) nor with the Keybord (I also checked the Key Bindings they are fine nothing has changed). In addition, when I try to unstuck my character it says you are mounted.
I cannot move neither right left forward backward. I cannot do anything basically. Please help to unstuck my character.

From the website go into My Account>Services>Select Realm>Select Character>Set Currency:Free>Character Unstuck