Just came back after a 4 month break, 4 games later perma banned

So I'm not usually, or like 99% of the time the toxic guy. In fact what i did in this chat log is extremely rare for me to say. But even so, a perma ban? Like seriously? Was it cause i said %%%%%%s? I said that first part cause i got 3 man ganked top, meanwhile my team mates are feeding, and i was just salty the whole game cause I'm back from my break(which i took cause i thought the community was getting to toxic and skarners still not viable) and i get team mates dying left and right and usually i'd just be peeved but even teemo mid admitted to trolling, meanwhile enemy team is being condescending, so yeah, my jimmies got rustled, but a perma ban?! I only ever been ban once before, also after a break, and because i said a racy joke in chat which honestly no one took wrong, the entire chat that game was, me: gl hf me:racy joke much much later: gg wp but they were a 4 man, so yeah. And i got a 2 week ban there. Like if you guys think i deserve a ban, fine, but like 2 week or something, not perma. Is there anyway to appeal this, or reduce my sentence? Or can no one ever say %%%%%%s in chat no matter the context? The hilarious part is I immediately got a sportsmanship reward on my log back in, so getting a perma ban 4 games later just seems weird.