The rules are very simple, if you want detailed answers email the Thai embassy/consulate with exactly what you want to know.
Applying for a DTV is a very simple process provided you meet the criteria and follow the instructions and allow enough time to apply in the country you choose to apply in. These time frames vary from country to country.
agree its Thai logic, doesnt make much sense to foreigners, the trouble is quite a few suspects have slipped through the dtv soft powers net, so the government are probably making it difficult for them and everyone else that open accounts this year and last ..what nationality are you?
Freezing accounts where they suspect suspicious activity, unusual flows in and out of the account. Go to the branch I’m sure they will be understanding if you can explain the source of any particular funds that have attracted the authorities attention.
If you really want the DTV transfer 500k THB min equivalent back to US$ account, follow the rules and what they tell you then send the the statement they require