^ It is simple, they could send it back to you if they wanted to and if they have full access to the address where you accidentally sent your fund.
It is a shame to them that it took a month but the fund was not recovered, so where is their good reputation right now?
Contact their manager too on their signature campaign, it will probably help you but don't expect too much, probably he surely has a contact direct from the duelbets team.
Well, good luck to you, and update us here on the progress of this case.