what are you supposed to do when your support tries to put you behind on purpose?

i think everyone had that situation once. your support is mad at you for... reasons. maybe you didnt pick the champ he told you to play. either way, your support is clearly sabotaging you. staying so far behind that he gets exp but not able to help you in any fights. going full damage and trying to steal your farm literally watching you fight the enemys but not helping you. what am i supposed to do? i get tilted so i have to make sure i dont chat or i get banned if i go afk i eventually get a leaverbuster so what should i do? and reporting them? if i wanna waste my time on a "good luck on getting a manual review" jackpot, i play lotto.
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