I think you should hire a lawyer. Your lawyer should first reach out to the consulate wherever the visa was denied and ask them the reason for denial. At the same time they should apply for Freedom of Information Act (FOIA) request. Get a copy of all the documents that the government has on you. It is a long, tedious process and it could take months or even years to get it straightened out.
If possible you should also look at 212(d)(3) waiver. These are available for non-immigrant visas such as a tourist visa even though you have a bar from entering the United States. More...
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