Report them with video evidence if you can get it.
From what I can gather (someone please correct me if I’m way off base) at some point back when server transfers were allowed, there was some exploit that allowed players to server transfer from unofficial servers. This let them transfer onto official servers with admin modified weapons (thousands of dmg), run speed multipliers, etc. Exploits like this are a large part of why server transfers were disabled (and likely will never be enabled again).
Honestly I don’t understand why this hasn’t been addressed before: I am not a coder but it doesn’t seem that difficult to simply do a search of the official server databases and ban anyone that has a >1.0 run speed multiplier or any weapon that has a significantly higher damage than what is naturally obtainable in the game. But I’m sure Funcom has their reasons.
Anyways get video evidence and report. Reports about hacking/exploits seem to get prioritized, but IIRC they do require video evidence of something like this.