If you have already reported in-game, you've done all you need to do. If you feel the in-game report function won't give Bungie enough information, even though they have all of their data available, you can also use the reporting form here: https://help.bungie.net/hc/en-us/articles/360049497451-Report-Suspected-Cheating . Do keep in mind that repeatedly reporting the same person for the same activity isn't something you should generally do unless they're being egregious about it; one report per activity is normally enough, but if you encounter them again in a future activity and feel they're still cheating, you can report again for that instance.