2 People getting boosted and sharing accounts.

So in my previous game I vsed a s4 udyr and a g2 vlad. a s4 player in a gold ranked game. She admitted to sharing an account and admitted that she was diamond 2 and playing on a friends account. theyre boosting because theyre friends because I checked their previous games on op.gg that theyre teaming. so this d2 player is boosting a s4 player in a gold ranked game. It's not even fair because this udyr inted and we had a major league but no the d2 vlad carried their whole team. I have pictures of proof this isn't allowed though.