You should know that hacking is not possible. You have nothing to worry about if you truly did not do anything wrong. And what's this that you will get banned at 8:00? That's completely asinine and you're very gullable if you believe any of it.
Hey there ASSAS1N MAST3R! Reporting players via the Xbox Forums is against the Rules, if you're being harassed on Xbox LIVE, please review the how to handle harassment sticky
post. If you have any further questions regarding harassment, feel free to post a thread in the 11 - Communicating on Xbox LIVE section. :)
In order to ensure he can no longer communicate with you, please make sure you block, and file a complaint against the player(s) involved in this incident. :)