its very unfortunate you got hacked but i dont see how the screenshot you used is enough proof. i dont think staff can do anything about it either way. its not a matter of good or bad staff. there arent staff to solve every issue you're ever gonna have and i think this is one of those issues. i could be wrong though. i dont know every single thing in the world
Mana Staff can do nothing about it, however you can contact discord support team here and explain them your situation and most likely if it is true you will get your account back! Good luck and sorry for your loss~