There are people creating small expedition groups and afking inside Citadel of Chaos so that other players are unable to go inside. Should definitely consider increasing the number of expedition groups that can go in or this will become a reoccurring issue for players especially when there is a server wide drop boost.
Report and they will get punished (if you know theyr names)
but youve to be fast and not after a day or so lol
Or punish the players for causing the harassment of other players XD
If can get the evidence in game to submit it.
I agree, players who are exploiting the game should be punished. If it's within the scope of the rules, tweak the rules so that they may be punished accordingly.