Well, first of all I would go and submit an official complaint through internally (as you are required to do so by the third party dispute solvers). After that and if does not work, I would submit an official complaint on AskGamblers. If that fails, I would ask Leo who they use for the outside dispute resolution, for the UK it's IBAS, you need to find out who they have allocated in your country. Lastly, I would file a report with your country's gambling regulators and also Malta's Gambling Commission. Hope that helps buddy.