Can't report account sharing and toxic behaviour help

Does anyone know how I can report account sharing + toxic behaviour (harassement, sexism and racism) other than in game (I already reported I think one of them), BUT it is gone from my history because I played a lot of swifts and because of that I can't send a ticket as it says it isn't in the last 20 matches. I have clips of the match and a screenshot of the player admitting their duo is using his account to play. I don't mind sending it here if that works out instead.