I assume that there is no change here?

it's very strange, it's not even a big amount but however, this is already too long a period and there is no justification for it. Also, not having a time limit for solving a situation like this is absurd.
As I see the representative account of duelbits is inactive from 1st July, perhaps there is a logical explanation like holidays, for example. it is certainly completely unprofessional.

OP, I suggest you wait for a max of two weeks (14 days is quite enough for all eventual checks) then you need to create a flag on their account and ask for support from the forum community.