Hi, you can’t post this in this forum because it’s not a bug. These guys just allegedly have good friends that farm XP for them, and it’s a legitimate way to farm in the game.
If you feel like this action is illegitimate, for instance because their “friends” are actually bots, then you still can’t post this in this forum, as explained in the pinned post Reporting Hacks, Cheats, and Exploits -
If you would like to report a hack, cheating, or other activity against the Terms of Use, please send a detailed e-mail to hacks@blizzard.com .