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.
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.
That's a huge payment for an account. Really curious why your buying an account for that amount which is totally free.
I need it, he promised to sell it to me, but didn’t give it to me.