I think there are a few things to take into account here. The first is that in custom games, the burden of knowledge lays upon the player to know the rules of the game he is playing. If you don't know the rules of ARAM, and then continuously break the rules of ARAM, even if its unintentional, I believe that the otehr players have the right to report you for that. Now, I don't think you should be punished for it, but you need to communicate that you don't know the rules before the game starts.
Spamming is never acceptable, I don't know how that is difficult to understand, and in Game 4 you were an absolute ass to your teammates.