Reminder: Number of reports per game does not matter.
Pardon my language. If you got dainty eyes/ears, close them for a second.
Number of reports Don't. Fucking. Matter.
So quit your bitching about how the premade screwed you and that's the only reason you got banned and that the ban system is broken because you are innocent. No you are not.
Report or reports in a game just flags the game. It doesn't matter if you get one report from the game or nine, nothing would happen unless you been a toxic little shit. The system does not care how many reports was made in a game. It doesn't say "oh look, there are four reports that game, that makes it more believable then just one report!"
If you were banned for it, it's not because the four man premade "screwed you over", it's because you fucked up. You aren't innocent, especially because one game could not get you banned by the automated system.
Edit: I made this post in a rush, so here's some more information. A helpful link from Nobody1111: http://boards.na.leagueoflegends.com/en/c/player-behavior-moderation/tvviuURj-multiple-reports-and-other-misconceptions And another from TheArtifacts: http://boards.na.leagueoflegends.com/en/c/player-behavior-moderation/9VrUtrJo-being-solo-and-having-a-team-report
P.S. Personal anecdotes about how you were banned because "premade" (fill with whatever grievance here) is a fallacy. If you are going to argue against this, saying that the information provided by me is false, please send me some proof from either forums from Riot or other valid information that might make me eat my words. Thank you.