Seemingly Random 2 Week Ban?

I was suddenly banned this morning- no warning, no one/two day ban beforehand, just an outright two week ban. I don't believe I have been toxic in the last few weeks, since I stay mostly quiet in games, except for friendly chatting. I can understand if this sudden ban is the result of something that may have happened a couple months ago, however I would like to know the reasoning behind something this big- which will also end up denying any ranked rewards. I have plenty of friends who constantly trash talk in every mode, and seeing me suddenly get banned while they enjoy their borders is very upsetting. Perhaps it was the ban waves for ashe scripters? I did get matched against one in an ARAM game. Or maybe the automatic feeder bans? I did horribly as Singed recently (big surprise), however I was not trolling, I was attempting to get kills and built in a non-trolling manner. In any case I'd love to see this resolved- either by proving my ban or perhaps resolving it, and thank you for your time.