It's been 72 hours since I reported them. Still no action taken by mods. Kind of ridiculous and disheartening. They are currently swallowing up one of the few remaining active players who aren't one of their multi accounts. The moral of the story is that it's okay to cheat apparently. Or at least if you cheat, Bytro won't punish you until after you ruin the game.
No, it is not ok to cheat and the punishment for doing so is expulsion from the game and deletion of the account with no chance to get it back. If Bytro has not done anything maybe it is because they are not multi-accounts, or maybe it is that they have not reviewed the case, do your best to report through the game and wait one more day to see.
In the meantime I suggest you to place spies in intelligence mission in the countries that you suspect that they are multi-accounts, to see if they manage to intercept the communications, if there is communication between those countries through the game chat then they are not multi-accounts. On the other hand I also suggest that you contact the other players who are not your allies and explain the situation to them, suggest them to create an alliance between all of them to join forces and be able to face the multi-account, tell them that only by joining forces they will be able to defeat it.