Got ban for intentional feeding, but it was not intentional :(

I am banned for 2 weeks for intentional feeding, but i feel like it is so wrong, because it was not intentional, we all have owr bad games... that is not a good enough reason to get banned.

I was playing with one of my friends, it was the first time we played together, he thold me he is a good adc, i play suport a lot but i am used to tanky champs, tryed to pick leona, but he insisted to pick nidale so i played with nidale, that was my first mystake because i am soo bad with her. We got destroyed in lane, i played like a huge noob, just like my friend :(.

At some point my score was something like 1/10/3 or something... i know, i was so bad for my team. At that point one of the players from my team was insisting to stop fighting because i was not helping, so i tried to def, they were allready in owr base, and now i made a huuuuge mistake, they were in owr base, the only thing that was not destroyed was the nexus, (my team destroyed 1 turret), the game was lost, and with 10 seconds before the game ended i raged and sold all my items... i know not a smart thing, but i swear i did no intentional feeding, no troll no nothing just the end thing... in chat i told my team like 10 times how sorry i am they lost because of me. I am so sorry that i played like that, but was not intentional... and also sorry for the rageing in the end.

So guys what do you think. is there something i can do to keep playing?

Please help me! I hope you'll have a great day!

p.s.: Hope i posted in the right place.