This is how its going to work Nahlij. No other way, only just how I've stated it below.
We don't like hackers. People who play the game don't like hackers. We all know that. By not showing your demo, you have become a semi-hacker, as there is strong belief that you hacked, obviously by a request of a demo, but also, because you will not hand a demo in. We will not accept hard disk space as an excuse, we will not accept 'oh I typed in stop', we will not accept 'oh get a life <insert demo requester here>, you hacked before', we want your demo. If you do not hand in that demo, I'm sure all of us on the committee would like to give you a week or 2's vacation from the game, so you can think about handing the demo in instead of playing the game trying to get away with it. We have a thread here, we have a thread in the committee boards, you will not slip through. Hand it in before the forums see another thread about this, possibly with some proof as well, because if that does happen, I know I will not go easy on a ban time, and I'm sure there are some more committee members will not go easy as well.
If you don't agree with that Nahlij, bad luck. Rules are rules. At the moment by not handing a demo in it seems you have most likely broken the rules. If you are pretty meddling sure you didn't hack, then post the demo. Do what everyone else does, hand a demo in to the forums, or just the committee.