Account has been hacked

My Account seems to have been hacked on 7/11. The same user name keeps coming up during the arena event. [removed, please don't name and shame]. All of my plants that I have acquired through those tournaments have been locked. My current plants are not at the same levels. Much lower. It will not allow me to win a tournament game and it keeps pairing me up against user [removed]. I would appreciate if you could restore my account.