My answer is no, don't waste time because they are not doing something wrong.
this game, have some things that you can do. You can have 5,6,7,8 friends in your league perfectly, and the worst can tank the season, and give the victory to the better. I too have a group of players from Bulgaria and other, that usually play in the same league, and, they, send gifts to others, come to see matches for the 2% bonus posesion, and do transfers.

That's nothing illegal, is something that in this game you and all can do.
Maybe, and of course is not beautiful when you are in a league with one of these friends group, because they can obtain a defeat thank's a friend, but, that's the rule. the law. the T11 rules, everybody knows that, and who wanna do his own rules, go in wrong way.
If they are not your friends sure that next season you will not face these teams.