Permanently banned without even warning

Dear riot, today i got banned by tribunal. Yes i'm guilty, but i did not get any warning about my offensive chatting or something, this is not fair at all. I just got banned and that's it, and permanently? I paid a lot of money to this game, and now all my investments ar gone? I am guilty couse of raging, but getting perma ban without even warning about my offensive chatting? That's not fair at all, i feel my money washed away now. I got banned for 3 games that i raged, and non of those games after i got warned about my offensive chatting, i would been stopped playing if knew about that i'm going to get banned if i continue. But i did not get a single warning and i think this is unfair. I would agree with permanent chat ban, because that would be fair, but why did i recieved a whole game ban when i simply used chat? I feel sad now for all my money wasted, and got such an easy bann without warnings. I seek for justice, i deserve permanent CHAT ban, but not GAME ban.

Best wishes, D8yi.