I went to my bank branch (the Big Blue bank) this morning in central Pattaya and after multiple requests for the Bank Letter over the past 2 weeks they finally provided it to me.
Just in time as my next stop which was immigration to renew my retirement extension. In-and-out in 15 minutes and got approved.
I either got lucky or the Bank has changed its policy regarding the bank letter...possibly because of too many customers getting angry and closing their accounts,
Who knows.