What can I do to get a troll punished fast?

Hi I just played a ranked game. This wannabe troll picked aurelion sol as support and told us that he just bought him yesterday. Anyways as expected we lost the match and I reported him post game for intentional feeding. But then in chat he said, "hf, report me. but nothing will happen. bye :D" I took a screenshot of it. Is there somewhere else I can report the cocky player who goes on ruining games like this for others? thanks
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