What can be done for players literally boosting for the opposing team in ranked?

I'm not reporting anyone here, but according to these people, they've gone and acted exactly how they've acted in this game hundreds of time without punishment, even with being reported. During this game these 2 players announced they're basically going to lose the game intentionally and continued to do so. The question is, why should I report if the system will not do anything about it? (I am assuming this post will get deleted, should there be another way to report or provide evidence in some other manner, please let me know)
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