Saying the abbreviation 'kys'

Two players in my game said to me 'Heimerdinger, can you say the abbreviation for kill your self?'

I was confused at first why he didn't know the abbreviation, but the game was fun and layback, and we often would make jokes, so I didn't worry and I typed it: 'kys'

Then I was reported for bad behaviour. I wasn't aware saying it would ban me for 2 weeks. Turns out, it was a trap set by him. He wanted to get me banned. Any way to lift this ban by asking a dev or anything?