You can only get banned from multiple games.

Barely talk for literally ages. (Yes, that's right. I didn't feel the need to talk or communicate at all for a very long time until recently when two players were bad enough to warrant it.) A game with a duo queue comes up and suddenly mid game they start flaming people. I tell them to shut up and stop it. They both gang up on me and start harassing me specifically. I attempt to defend myself against two people spamming all caps at me. Game ends afterwards. Chat log shows up with a log from only that one game.

Wooooowwww you're right Riot. It's totally multiple games that get you banned. That's so believable guys. Wooooww. I mean, I'm so convinced.

No, I don't care about the muting that game. I care that Riot lies so poorly.

No, I don't care that I'm supposed to act like a massive coward and not say anything. I care that Riot lies so poorly.

No, I won't be posting my chat logs. I don't care about the ban, I have more than one account I can play on. I care that Riot lies so poorly.

Although, despite the fact that I've said I'm not interested in those three things, I fully expect a whole slew of people to start yelling at me for exactly those things, while calling me the scum of the earth.