If you already provided the required information like your email address associated with the account, your username, and the wallet address you used to create the account or any other required information that helps to prove your ownership they need to check them and release your account.
Duckdice is known for scamming user before for not paying huge win due to there insufficient bank roll. They do the payment installment and slowly build again there reputation up to this point so Im not surprised if issue like this arise now assuming this is legit accusation since Duckdice is not defending themselves here to verify the claims.
The report of OP doesnt have proof and only words though which means its very hard to conclude despite Im always against bringing back the Duckdice reputation to neutral again as second chance for them. This sucks but Im not expecting any clear resolved on this issue if they are already dodging the OP concern through CS.
They celebrate Christmas till 3rd June 2023! This is definitely not the excuse anyone wants to hear in that situation. What kind of company celebrates a holiday for six months?
This is clearly a typo on OP side or CS since most companies is really on holiday during christmas and new year then resume on
Jan 2023 next year.