My account is banned. Why?

Greetings! I have just tried to enter in the game and I realized I'm banned. Honestly, this is very frustrating, cuz I don't remember breaking any server rule. I would like to know the reason why my account is closed and when I will be able to login again. I do not buy or sell gold, I do not use cheats, I do not bug exploit, I do not start fights or anything, but here I am.
The only reason that might be hardly possible is that I /w people asking them "hey, are you interested in a raiding guild?" If they say yes, we proceed, if not, I say GL and that's it.
I don't want to sound like someone who does not have anything else to do except playing WoW, but when you spend hours everyday for months, if not years to develop your characater, it is very unfair.
My hero name is Jubi. (UD rogue 60)
The only reason that might be hardly possible is that I /w people asking them "hey, are you interested in a raiding guild?" If they say yes, we proceed, if not, I say GL and that's it.
I don't want to sound like someone who does not have anything else to do except playing WoW, but when you spend hours everyday for months, if not years to develop your characater, it is very unfair.
My hero name is Jubi. (UD rogue 60)