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When we hear events like this it is usually because the customer is the victim of an elaborate internet swindle and that they are not dealing with who and what they think they are. Exorbitant tax demands, typically entirely unwarranted but plausible to the unwitting victim of the fraud, are asked for, when in fact, if the funds are in excess of the taxes, the government can attach what they are entitled to and you would not be required to pay anything out of pocket. What else is suggestive of scam is that the bank has not responded to your requests.
If you were indeed dealing with the Dalian Bank in China, it would appear that you would have a potential suit. Then the issue becomes whether you would want to sue from here or hire an attorney in China to bring an action there on your behalf. The latter would be more practical, since an international suit would be costly and protracted. Then, even if you won, you might have to go into the Chinese courts to try to get the judgment enforced, because otherwise the bank may not pay up,
Just checking in to see if you need more help or any clarification of my answer. If so, please reply here on this question thread.
US agencies have no jurisdiction over foreign banks. That's why in order to address this, the most efficient way would be to find a lawyer in China. In order to find a reputable English-speaking Chinese attorney, your best bet would be to contact the US Embassy in China. They keep a roster of attorneys to which they refer Americans who need the services of a lawyer while abroad.
The next best alternative would be to consult with an international legal referral service. Here's one of them.
If you want to mount an international suit from the States, you could contact the Georgia Bar Association's Lawyer Referral Service and if they can't refer you to an international business lawyer then try a commercial referral service such as Martindale.com.