correct, banks analyze historical account data, they will not call in millions of customers to ask them what visa they are on or to put blanket blocks on accounts. You proved my point and are now logically questioning the OP’s truthfulness of his statement.
the instructions are available for anyone to read as they are published on the BOT website. How would the bank know what visa your currently on if you opened the account several years ago? He certainly never opened the account on a DTV.