Reporting people for cheating with/without evidence

Yesterday I reported two people, who i will not name here as per the rules, for picking up and carrying the WSG flag whilst invisible.

They picked up the flag, and disappeared. We had 3 or 4 people on and around where the flag appeared on the map, but he was not visible. Tracking via the map, he then proceeded outside the base, into mid-map and was still not visible. To reiterate, there was no hiding place or higher or lower level for him to be, he was either under the map or floating in the sky, or invisible altogether.

I reported this, and encouraged many other people to report it. He was doing it for most of the day, because it happened in several games over the course of several hours. The reply i received to my petition was that "nothing can be done without evidence" and suggested a video or screenshot of the event.

I wasn't on a PC that was capable of recording video and presumably neither was anyone else or they would have. Screenshots of a map and of a place in WSG that's empty of players can be easily faked as to be pointless - like asking for a photo of the invisible man. So basically that means despite probably 10+ people reporting the same person for the same thing at the same time, as long as no one can record a video, he can keep on doing it - seems a bit excessive to be able to dismiss so many corroborating reports as a coincidence.

If an admin would like the names of the characters, i can provide it. But mainly I hope that you can look into this before it becomes common, given that it's difficult to prove.