You walked into unwarded areas and tried to fight multiple enemies that were much more powerful and fed than you were. Sometimes you were even AFKing/standing still near the enemies. Yet you still wound up with a pretty solid CS count, which makes me think you were a decent/okay ADC who was just trolling. Your decision making as a diamond player doesn't convince me that you weren't intentional feeding or trolling. Also, of the 28 kills your team got, you only participated in 3 of them. Usually, even in a bad game, I would think an ADC would be able to get their hands on a couple more kills/assists.
That said, I'm not letting Riot's FeederBuster (or whatever they call it) off the hook. I'm a bit shocked you got banned after one game considering your other games look pretty solid. There are posts on the forums of people/bots inting for 15-20 games straight with high death counts, no assists, no kills, barely any cs with all boots/all zeals/all tears that haven't been banned yet.
If you do want to protest your ban, you can still contact Riot Support, but don't be surprised if they don't reverse your ban.