Account banned ...

After 3-4 months time of break i decide to come back to wow and when i logged in my acc on the page i saw a ban 12 years 12 months but ingame i can logg in normaly and play .. i assume its some mistake or mby i m banned for some reason that i might did but im not aware ... never been even warned before about anything so honestly i rlly dont know why is this ban can u please tell me or if its mistake unban me ... thanks for your time ..

This is something you will have to pm an admin about. There has been some cases where some accounts were hacked into when the user did not give their information out.
Something that was mentioned before, but wasn't believed, since I hear some cases on global chat for 2 yrs now.