If banks cared about foreigner difficulties opening banks accounts it would have been dealt with long ago as there are many visa classes opened much longer than DTV and still can’t open banks accounts, if you think a ‘manager’ is going to update you about anything you simply don’t know Thailand at all 🙏🏼 what is known is that a DTV is a tourist visa and as such a agent will be required and even then it might not work as it has become much more difficult to open banks accounts accounts