Should i have been banned?

I just recently got permanently banned in league of legends. However my friend send me a link to how the punishment system works, and as it says on the link i should have gotten chat banned before i got a 2 week ban. also the reason i was banned was because i said the word fa@@ot in all chat as a joke and am currently friends with the person who i had joked to. even they had said it was unfair, and riot support didn't do anything when i had asked if it was possible i get my account unbanned. Just today i had a french exam in high school, and in the midst of studying is when i decided to play league to 'decompress' in a sense. and at that moment i got permabanned. i was originally using league to relieve stress from non-stop studying but after my match it just increased my stress dramatically, because i had essentially lost 240$ on league. the person who i had mentioned earlier from the game gave a suggestion that i relax and drink tea and study, which i did. it was really helpful and yes i do realize saying fa@@ot violates league's terms of service, but i didn't get any chat bans or punishments before my 2 week ban and i didn't even know i was supposed to get them until a couple days ago. the first time i got banned was for being offensive in chat as a direct result of being salty, which i have actively been trying not to do because obviously i don't want to get banned. i did not mean to be rude in all chat. and on top of this i know people who say a lot of offensive stuff in all chat every game. right now 240$ is a lot for me, and also i had recently just gotten around 35$ worth of gifts from my friend. i personally do not feel as if getting permabanned was a fair punishment. i would like to know others opinions on this. once again i meant no harm, it was just a bad word that i said once in chat. i'm going to put a poll on here so i can see if anyone agrees with me, and also think i shouldn't have been banned. well i guess this is bye for now.