Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello.

I was trying to log into my account today, and found out it has been closed, why?.
I don't understand.
I can't remember doing anything wrong.
I was doing an instance "Stockades" the day before, and before that i was questing and doing the same.
Could you please look into this.
I put alot of time on my character "Daexsaviour" =/.

Thank you!
Best regards: Daex