Clearly they are not interested in paying.
If they had the money (Which I believe) and they still have access to the money (Which I dont know) all they have to do to pay is send checks in UK pounds from a UK bank. US banks will deposit checks and make the currency exchange. All banks will.
My guess is neteller is trying to not launder money. Part of laundering money is taking the money and then RETURNING the money. If you just take money, you can't launder it.
Up until the arrests, they could argue they were not breaking laws... Now the US has said we feel you are. It seems they dont want to launder any more money...
None of this makes sense since what has been done is done, but at least its a theory that makes a little sense as to why they stopped sending money back to US banks IMMEDIATELY.
Sean