Just got into a game where a player that not only afk, he try to sabotage our team

Normal blind pick, got a Brand support and our team were doing so well, but after we die 1 or 2 (we just get so cocky). Brand didn't like that, he curse at our jg, told with the enemies our locations, took our buff and not only that, he moved around to avoid being detect by the system. I reported him after that but not so sure since it just an automated system after all, and this dude know that.

Also I know that this type of post need a chat logs but idk how, still trying to find it