Logged out for work came home Logged in and banned

[Nagazel]

I was playing before i went into work today ran around for a bit did random kills in WW traded with a guild mate for some Pally gear logged out..... came home from work went to log in and it tells me my account has been banned. I have no idea for what i dont break the play nice rules havent cussed in general chats i dont think and dont box or have custom mods installed for anything what is going on?