Your scam accusation is not complete due to lack of sufficient evidence. And it also means that Megaplay.io didn't give you enough time to collect evidence. But if you don't have enough proof of how exactly this site scammed you, it's hard to come to a conclusion, if you can, try to collect some more proof. Their representative exists on this forum https://bitcointalk.org/index.php?action=profile;u=3508147 , so hopefully they will give a statement from their side here about what actually happened to you.