I don't have the chatlog.
Then you don't have a case. Without a chat log, we can only take what you say at face value, and, considering how people naturally try to weasel their way out of punishments, we tend to consider things at face value with a mountain of salt.
So, where you say:
I was responding to everything said with calm rebuttals...
All we can imagine is that you were retaliating or counterflaming - or at the very, very least (although I personally believe it's one of the former) fuelling a pointless argument.
You can think what you want about what was said, but I know the truth of the matter.
As mentioned earlier - truth without evidence is not a truth to be considered. You can claim you know the truth, but without any chat logs or evidence to back up your claims, we won't have any reason to believe you.
Riot has gone soft and they are bringing down the hammer for anything.
You've yet to prove this.