So, i got banned for 14 days?

So, yesterday i was playing as panth top against an olaf (draft pick), i preety much lost the early game duo to a really stupid decision of me and my midlaner starting with the enemys red buff and coming for an unsuccesfull gank at mid.

So I got preety much outfarmed and outtraded by the enemy olaf and i got frustrated really fast especially because olaf was in a perfect spot for my shyvana jungler to gank.

**But anyways this is not why i am here and starting this disscusion, rather i can not find a real reason to why i got banned since i was just having a bad game and the feeding was not intentional. My stats at the end were 2/15/6 and we even won this game which was just a draft pick... **

This is literally the first game this season that i was doing so bad and making this kind of stupid stuff as you can see here: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/3167238592/98566871?tab=builds&participant=2

(that 7 tear of godesses were bought because i thought the enemys would finish the game already and having those 7 items would show my frustration at the end... :^))

And now i am even more scared of getting permabanned if i play bad games, especially since i invested really, really much money into my account (talking about +300€)

my acc link (op.gg): https://euw.op.gg/summoner/userName=SexyBabe69