Yes, they have the right to correct the mistake, we agree on that, so why they did notified me last month when they revert the grade? Why did they not emailed me about it? Why did them did not put my balance in negative? If you want to correct something you need to make it to the other part, no?
No. Again, you aren't being reasonable. You cashed out ill-gotten gains in a tiny period of time. They had no reason to suspect that you were being honest, especially if it was your entire roll. They knew the only way to get you to do the right thing was to not say anything and hope you were so full of yourself that you'd deposit again.
You lost the bet. You agree to that now, even though you were lying about "other books" before. This is a good thing. If they had contacted you and informed you of this mistake would you have returned their money? If yes, then there's no discussion needed...you wanted to do the right thing and did. If no, then you're a piece of shit and they were right in not trusting you and karma got you.