I don't know how you came to such conclusion because is DuckDice.io known for their shady behaviour and unresolved accusation and if you don't know about this please take a look at their trust page: https://bitcointalk.org/index.php?action=trust;u=917361

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OP, if you're accusation is true the chances of getting the funds back is slim in my opinion but you better post about your issue in their ANN and also move this to the scam accusation board to get their response.