I was instantly perma banned, no warning, no chat ban.

I was playing a game of all random urf and i was playing Draven (the most toxic champ) after 2 minutes one of my friends went afk due to lag. Due to the extreme circumstances i began to flame my team and said many racist or homophobic remarks. After my next game i received a notification that i was permanently banned for toxicity. When i looked at the chat log i agreed that calling people such crude names and making such remarks was not fair to my teammates... but then i remembered that all 5 of the players on my team were part of my 5 man premade that i was currently in a discord call with and none of them had issued a ban. Although i accepted that i required a punishment for my actions i could not accept a perma ban so i contacted riot and they told me "You were suspended for the game in question. If no one thought your behavior was inappropriate, you wouldn't have been reported. If you didn't get reported, you wouldn't have been suspended." to date the only explanation i have to why i got perma banned for that game was that i said GG EZ at the end after winning a 4v5.