If your bonuses were revoked, you’ve probably broken one of the rules. This is why, again, this LeoVegas bonus review Canada would like to emphasize the importance of reading the Terms and Conditions. In cases where the casino determines that you’re a cheater, you will not get your bonuses back.
However, if you believe that this was a mistake and that you followed all of the rules, then you can contact the LeoVegas casino support. After you do it, someone will explain the situation. Your chances are probably not great, though, as giving bonuses back is not extremely common.