I used my local Vietnamese bank, with the saving account and I think any bank would work. Sorry for the rejection, you might want to try again with a normal bank or in other embassies
As far as I know it’s not a requirement for 500,000 baht for entire 6 months however there will be suspicion if a huge amount being transferred to the account prior to the appointment day. I think they do want to verify it’s YOUR money.
those have nothing to do with DTV. So far, it’s just all the documents listed
I don’t have to provide those documents you me mentioned when leaving Vietnam. The airline asked me about my return flight and I told them I got the visa so it’s not needed. The immigration asked me about my return day and I told them I got the DTV Visa.