Banned for joking with my duo friend in ARAM

So here I was playing an aram with a friend. We joke at each others expense, we mock each other, we have a sense of humour that is pretty typically boyish, we rib each other and just have a laugh.

Early on, like 2 minutes into the aram, I was throwing some pokes, and I ate a few skillshots, so my mate started pinging me back. Being that it was my mate, I just said "kys" to him a couple times jokingly. Of course, the Nasus on our team was telling me to back too and immediately said "reported" and then said he muted me before I could say I was talking to my friend that I was queued with. I had no chance to say "Hey sorry but I'm talking to a friend". The guy muted me instantly upon incorrectly thinking I was mocking him. Throughout the game I then had little interaction with anyone, beyond the occasional message to my mate, such as laughing about a few of our bad calls and deaths. I called our nasus "poor susan" when he got caught and I couldnt save him, and he then said that he muted me at the start and that he would report me again, to which I said to my friend "you reckon he muted me after I said susan?". The enemy EZ tried to make a move and Nasus absolutely deleted him, so I said EZ got fucked up. After that I said nothing, and we played for another 10 minutes or so before the game ended. I said nothing in the lobby. Not even 20 minutes later I receive a ban with this game and the dialogue from it being the only thing on the reform card. I mean, the actual "offensive words" I said were "kys" twice to my friend, and "fucked" when referring to ez getting wrecked. Nothing else I said was negative, and I wasn't talking to anyone else except my friend in the game with me.

I honestly feel like this was a case of someone just being a tad sensitive and assuming that I was being toxic to him, when I was just playing a fun game with my friend. I spent the whole game just playing properly and if it weren't for my mate playing with me, I would have honoured NAsus because of a few sick plays he made. The guy muted me from minute 2 for something I said to my own friend, and I still enjoyed the game with him. But he's just completely victimized himself here at my expense, when all I was doing is joking with my mate the same way I always have in every game, and had Nasus even once asked if I was talking to him, I would have said no. But I didn't get the chance.

I know what kind of sympathy I'll get for posting this, but I've been waiting 11 hours so far. So I'm just sitting waiting for a ticket response, expecting to get told there's nothing that can be done. I think it's a bit rough to have essentially had someone mistakenly take offense to me and get me banned when I wasn't even talking to the guy. This guy didn't clarify who I was even talking to, and then muted me removing any chance of me explaining that I'm just talking to a friend. I wasn't attacking anyone, I wasn't being toxic to my team mates, I wasn't insulting them, I didn't ping spam, I wasn't even talking to the guy that's reported me. My reform card, which I can post later (at work atm..) has like 8 lines of dialogue, and once you have the context that every thing I said was directly to my own friend with no attempt to insult or mock anyone with any kind of toxicity, I just don't see how this warrants such a heavy punishment - especially as I've made a lot of effort to be a better player since I last got a reform card in april 2016.