I'm gonna be honest, this story isn't really making any sense. Kinda odd how you took a break and you come back and you've been VAC banned. If someone did happen to hack into your account, Steam would've sent you an email telling you that a new login has happened, and they probably would've changed your password and stole your cs skins if you had any. VAC bans are not lift able. Best thing to do, if you weren't hacking, is to get a new steam account and to make sure that you have all authentications on. Such as the email and mobile one. And if you do make a new account i wouldn't recommend not using the same password and email, to be on the safe side.