I read "throughly"
and can point out a few likely areas of contention for people that you might want to avoid in the future:
You seem to verbally quit on your team well before the game actually ends (at least from the few cases available). Alone this is hardly punishable, but when looked at in the context of the games, this seems to serve as a point of contention between you and your team which openly invites a lobbing of criticisms and personal attacks back and forth. As a casual observer, limiting the amount of contention between you and your teammates is an excellent
way to avoid being banned (or even reported to begin with). With that said, in particular the way you handled the first game by proclaiming
Soraka [All][00:22:13] :This team is retarded
Kennen [All][00:22:27] :ur the one feeding
Soraka [All][00:22:28] :Team cries more then a nursery
isn't really appropriate in the eyes of many people. Calling your team retarded is just pointless and stupid. It serves no purpose other than to annoy and degrade your teammates (which is something Riot actively discourages).
Since the question you posed was whether you actually did something to deserve a ban, I would say that you did, in particular the quote provided coupled with what can be gleaned from the context of your behavior in the other cases. Is this the most egregious case? Probably not. But your actions certainly at times seemed to dip below the acceptable threshold.