Nostalrius Begins - Quality wow vanilla realm (1.12)

Hi I created a new account and created a bank character and a new toon to level got summoned to org and went afk after my bank was invited to a guild. i came back in like 5 mins and account was banned can you please let me unban me or know the reason for the ban. character name Idabank account: **********ght

Thanks so much for the help