Block my caracter at low level

hi guys
i have a question about blockin my caracter at level 40 or 45, i play on icecrown any one have idea please ? ty

Google it, there's an NPC in captial cities that blocks your character from gaining more XP. Don't remember the exact name, but for Horde there's one NPC next to warrior trainers in orgrimmar. Alliance is probably in SW.