Why you even want to purchase a Binance US account? Are you a US citizen? As far as I know registration on Binance Global is free and only will be needing KYC if you will transact more funds.

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Add more details on your conversation it seems like a shallow discussion and will be needed more proof to prosecute the suspect of this scam. ^{So far the account has no complained yet but there is a feedback of that he had close a good deal.}