riot why permaban me when i didnt do anything wrong?

i think its really dumb to permaban me because i didnt use bad words. i dont think permaban is right. i spent over 1300 dollars in this account and you guys banned me so it would be good for you guys since i have spent 1300 dollars for riot but what happens to me when i didnt do anything and got banned? why couldnt you guys ban me for a month? you guys just permabanned me right away???thanks riot i wasted my 1300 in this game.....