Cant log in again ...

Hello for some reason i cant log in again... i check WTF file but everythig is OK but i just cant ... and the odd thing is i log in like 30min ago for Daylie Quest with my Rogue and i log off then i cant enter . Can you do something abouth this pls ?
And i want to say prety much every ( Horde ) player is using bloody hacks last night i killed one horde in Shrine of seven stars and then ofc he kill me but the thing is at furst he was Warlock undead then for a sec he change into Blood elf Paladin then Tauren then Troll .... ( littlewitch ) is his name ...
like allways horde noobs are nothing without hacks .... but it will be great if you can do something abouth this thank you .