Banned for 24h after glitch

Hi Guys

just a couple of minutes ago i was playing with two friends. I am quite new to the game (lvl 22). I was driving up to a gas station where there were 4 enemies. Just being in the moment i killed them, but they did not shoot back... 30 seconds later i got kicked from the game and banned for 24 hours.... In retrospective i think i somehow turned invisible!?? I wanna make it clear, that i am not cheating (yes i know that is what everyone says...) I would highly dislike getting perma banned from the game.

Has anyone experienced such a glitch that the character turns invisible? What is the procedure now? Thanks in advance for any word of advice.