Riot needs to severely reform its banning system

I was banned because mid and adc continously harassed me and abused me during the game. I tried to explain my situation and why I was doing bad, completely accepting that things arent working; it happens. They constantly just kept yelling at me and making things worse until I eventually muted them. After the game I got a 14 day ban on my account. How is this possible? Why is it that you can just gang up on someone and ban their account?
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