Did Nothing Wrong And Got 20 min low priority queue ????

I was given a set of 20 min low priority queues for quitting 1 game..not only that, whenever i finish 1 game it keeps saying i have been given ANOTHER SET of 20 min low prio queue....I tried playing over it but it keeps refreshing so i have no choice but to ask for help...i have tried to get it over with by playing 5 games but its still the same..RIOT HELP ME PLS ITS FRUSTRATING!!!