I got reports for playing jhin adc after someone stole my role and being called trash.

I was just playing i call supp a veigar instalocks i ask what lane veigar he says supp i say im supp no response i say i guess im adc i go jhin midway into the game after getting 3 kills 0 deaths a lux in the mid lane dies after i walked up to roam and then proceeds to call me trash... i was astonished then after the game we lose i am told i should be reported and the supp the jg and the mid support me top does not acknowledge this after the game i get off after school when i get on just about 10 minutes ago i have a message saying this is instant feedback penalty... i am upset riot please learn how to govern your game server thank you.