You have plenty of time to post a screenshot, you're just choosing not to.
Because of either;
A. You're guilty
or
B. You're guilty
If I had to assume, it's both A and B.
With that said, you're evading the everyone's request that is willing to point out what you did wrong if you posted a screenshot.
But since you're not willing to cooperate with the board's request, which is posting a screenshot, everyone is going just point out you deserve your ban. Riot support will always point out what you did wrong and will walk you through it. I honestly believe you're just hiding the truth so you could maybe get a little bit of the board to side with you against Riot. Sorry, that's definitely not going to work.
Screenshots or move on.