OP Please confirm if you receive the balance in full since the representative did post the transaction id, it's the third party that blocked your account, and it is also the sports provider that marked your account as arbitrage bettor so the blame cannot be on Duckdice.
You're still lucky because other casinos will just keep your balance, Duckdice instead returns your balance if you think that you have been wrongly accused you can file for mediation with a third party, Askgamblers can be requested to mediate your case, but since it is the provider who marked it, your chances are low.