permanently banned error

i was playing with a friend of mine and we joke around all the time. i have no microphone and he does so i type in chat. i said some harsh things to him but got banned cause of an automatic system? i reckon i looks like i typed it to someone else but i was positive the whole game? so im asking is there anything riot can do about my permanent ban? i think its unfair and invested so much of my life and money into this... sad to just see this go like this in a split second cause of a small misunderstanding.

please reply, Hawkguy21.