Tired of people in ARAM game mode keep quiting the game inlast few second

I mean, first they like all accept the champ that been randomly selected, and all they have to do is wait for the countdown to 0 and start the match but they all like wait in the last 2-3 second and quit the game it happened to me about 6th in a roll. Please Riot do something about those people like banned there account for few hours maybe?
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