@Jerry *********
if this is your second one year extension then your agent was correct. You need your bank statement to show that you had at least bt400,000 in your account for the whole year, and the bt800,000 in your account for three months after your extension, and now bt800,000 in your account for the last three months. The two month requirement is only for your first extension. Every year after the first extension the bt800,000 has to be in there for three months before, and two months after, totalling five months, and the account can never drop below bt400,000. This is why your agent told you a full year of statements verified in a letter from your bank.