Hi. When was this and which office. You have opened another account elsewhere, fine. But first, is this another bank, like Kasikorn? If yes, the transfer you made last year, was not done on their account, how can they issue a bank letter?
As some members stated here, they got this, this week, it is the office, who just not want to waste time on it. They had no time in June, and now they probably not want to give it any time any more.
As I said, I had no problem myself in June, same office. Yes, I took another account at Kasikorn, but can use this for monthly method, only starting next year. What worries me, is that the manager tried to help, but that the letter, was not in the system any more. If she told him the truth, of course. By the way, I did a straight transfer to Kasikorn, for a smaller amount, showed also internet banking.
Like everywhere, you need to use your common sense. I have made investments, that gives good return on money, I would not have in my home-country, where there also enough risky deals.