Can you report the support for taking cs?

I just got out of a game where I was playing adc and my support for some reason began to take cs. I to,d him to stop but he replied saying I’m useless and continued to take cs. I tried to switch lanes with the Kai that was too and he switched as well. Basically I told him to stop multiple times but he wouldn’t. He still didn’t get banned even after I reported him. Why is it so hard to ban someone for inning but I get toxic report returns all the time
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