Hellp Amperaii,
I'm sorry to hear that happened. You can open a ticket here -
https://manacube.com/support/ and include any proof you may have of having this much score (If your rank is GOD or above that would be enough, or any screenshots you have in-game of having the score on your sidebar)
If you haven't already though, I would suggest relogging as sometimes the scoreboard can glitch out after a reboot and that fixes it.