The statement from Bangkok Bank spokesman was that DTV holders do not qualify for holding an account. As John mentioned your statement is hard to believe.
Bangkok Bank stopped allowing foreign tourists to open accounts since beginning of the year. Only people holding retirement or non immigrant visas are now able to open an account. Thousands of accounts opened on tourist visas have been blocked. Bank clients are being asked to come into the bank to sort out the situation. Without a long term visa funds are to be withdrawn and accounts closed.