Bingo.
Anyhow there is no point in complaining.
Simply close the Bangkok Bank account.
I have been with K Bank for years, I feel they are the most foreigner friendly.
If you have a yearly extension of stay based on retirement, shouldn't be problem with getting an account.
I recommend this branch in Bangkok -
Kasikorn Bank, Phahon Yothin Branch,
400/22 Phahon Yothin Road,
Sam Sen Nai Sub-district, Phaya Thai District, Bangkok
10400