Hi, welcome to the forum. duckdice.io is an authentic and good reputed platform.
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
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.
And would appreciate it if you'd actually take a look through the posts of this thread and the one you linked and not base your response off a thread title.