Bungie doesn't do anything about hackers or lag switchers or modders, sorry. They won't let you contact them directly because they don't do that either. Sorry :( this is tough luck.
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The old Bungie during the Halo days would take care of modders. For example, if someone modded on Halo 2...they had to play online that one time because the next time they tried to log on, their account was banned permanently.