How to report cheaters who use Alternate accounts in the same match

So by day 20 its very obvious which nations are ALT accounts of a leading coalitions member. How is this fair? They essentially feed off this ALT account the whole time, then near the end use this ALT account to attack with everything to cause damage and to preserve their precious stats. So what is Call of War doing about this obvious cheat? So do i report? How and will it do anything?