I agree you should have been pardoned, but I also agree with Gonzodamus that you overreacted to the Jarvan in game 3. He wasn't being offensive asking you to stop feeding -and you WERE feeding, even if it wasn't intentional- he even pointed out that he wasn't trying to be offensive, but you escalated the issue by making a thing out of it, rather than just saying "Sorry, I'll try". No, asking you to stop feeding isn't very helpful, but neither is threatening to mute everyone for the slightest thing they say (on the other hand I agree that muting the ragers on your team in the 4th game was justified).
That aside, you definitely shouldn't have been punished for this, ESPECIALLY in light of the outrageous bull that some trolls get pardoned for in the Tribunal.