How Many Games one Player should troll to get banned?

im just wondering. with this amount of trolls i see in the game ( not bad players actuall trolls with purpose ) its so huge i played DOTA for 7 years before League of legend i played HON but in any othe games i never saw this huge amount of trolls so repeadly They actually TROLL on purpose and they ADMIT it in the game and they just say "I DONT GIVE A FUCK" and after the game i report them i explain exactly what they did in-game but i never got a insta feedback and when i double check them few days later they are still playing and still trolling they dont get banned. So now i decided to ask RIOTERS . **How Many Games one Player should troll to get banned?**
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