Have you ever reported every users account that links onto that thread or not? Because, if I do find some users evading a ban I usually do that to get some attention to moderator/s by just linking it to the post or reply you've just made.
I see the same users in this report by @coinlocket$
6 suspect Full Member accounts using the same signature. maybe he can help to tag now those users who aren't banned yet that are on his report. What I advise is report again the users' account here involved to mods and if it hasn't been put into action then a tag is worth it to them, I think these are really alts and just controlled by one person. Good luck!
Thank you for suggestion and for reporting that topic with this cheaters.
I reported them to moderators, and I guess it is just question of time when they will be banned
If there's a ban evasion issue going on here, there really isn't a need for DT members to tag these accounts. The only thing you need to do is report them to the moderators. Mods will probably see this thread and act on it, but there may be a delay in doing so. Just be patient and I bet you that all of these alt accounts will get banned as well.
I am patient

Problem is they have much more accounts, but I can't prove the connection

Maybe someone else can do better job.