From comments in my topic, I know that other gambling sites take less than 1 week to give the solution for the similar cases (Take an example: stake and roobet solved the problem within 1 hour)
Well some gambling sites has their own dedicated support staff that is able to check your account while they have a conversation with you as for some other sites like Duelbits, I think they probably use a 3rd party support staff hence all these 'support staff' that you have been in contact with have no information regarding accounts in question so they usually ask you to wait until the cases are solved because they have no clue about those cases at all