The Tribunal is still down for maintenance, actually. They're giving it a huge overhaul to use in unison with the new player behavior systems currently in place.
That said, you were punished by the Leaver Buster system. It's virtually completely automated and places an increasing number of flags on your account for each afk/disconnect it detects (Usually beyond 3-5 minutes). The system makes no distinction between players that disconnect as a result of client side issues (in this case your wifi) and intentional afks because there is pretty much no way for a system (or human monitoring) to know the difference. It also remains a fact that your disconnect caused a negative experience for the rest of the players in the match.
As for the help you're seeking, I'm unsure as to what it is you're actually wanting. It sounds like you've already served all 5 chat restrictions. If you have, then just be careful to avoid it happening again in the future and the alert level on your account with drop back down to normal on its own. This is because, though the flags will always be on your account, the weight they hold will gradually decline so that only repeat offenders are consistently punished and not players that disconnected due to infrequent circumstances. If you haven't, just bear through them and avoid it happening again if you can. Watch a show or do something else in the background to pass the time and keep your volume at a level that you hear the queue timer when it does pop (so you won't have to rewait the whole twenty minutes).
Hope this helps.
