first of all, you should report the incident to roblox by sending the an email with proof that it is really your account so you can get it back. second try to figure out how you got hack so you can warn other players and you can avoid it if you come across it again. and lastly if all else fail, you can just start again. yes it is sad that you lost your account but hey life goes on it's just money and you'll prolly forget about this game after 5 years or so.