2 week ban. Kinda annoying.

I was in a game and a Jax player was playing terribly. I give him advice. (sensible advice without being toxic whatsoever.) The player continued to int and smack talk my premades all game. Eventually. 40 minutes into the game, I was started to get tilted. I had a one sentence outburst of a few swear words and that was it. After the game (we surrendered because Jax AFK'd) i joined another queue. I suddenly get the post of 'you have been suspended for 2 weeks'. This was a suprise as it's my first ban and only becasue of 1 sentence i said in 1 game. Nothing racial or derogatory. Just swear words. I always thought it was a 10 game chat ban and then the 2 week or whatever. Just want to know for what reason I got banned off the bat for 2 weeks.

Many thanks for reading.