got demoted bc of autofill wtf riot

I didnt ask to support i didnt want it id rather wait 5 min for a game and get mid or top then get autofilled. my mid wont swap np i play support ig mid feeds his ass off our amumu was also autofilled feed his ass off and i finnaly get out of that stupid game to find out ive been demoted NO FAULT OF MY OWN i cant carry stupid please make autofill a option im so tired of it i play league to play my role and what i wanna play not to be thrown into a fuckign circus and lose and get demoted