Riot Report an unreportable offense

I go in to a game and player who got Jungle says "Im going adc" the player who got ADC role said "No your not you are jungle" The jungler says nothing more and locks in on {{champion:236}} with{{summoner:7}} and {{summoner:4}} stealing away the role from the player who got ADC and there is no report for this... he wasnt feeding so intentual feeding is out..he wasnt flaming so Harassment etc are out he just stole the role and there was nothing we could do...
Report as:
Offensive Spam Harassment Incorrect Board