A creditor cannot seize or freeze your bank account without an order from the court and in order to get that they must have obtained some judgment against you. You need to notify your bank and obtain a copy of the order of seizure from them and then you will need to contact the creditor and obtain a copy of the judgment against you. If you were never notified of any suit against you in which the judgment was obtained, you would then have to go to the court after getting the judgment from the creditor and move to vacate the judgment and order of seizure based upon violation of your due process rights.
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