This is if you just need to show that your Telco Account is aligned to your passport and that passport to the bank account. It is a Bank of Thailand requirement for all mobile banking in Thailand - not just Bangkok Bank.
I had visited before but never thought about living here. Just over a year ago I came up on scouting mission. Four trips last year and then came up twice in January looking at houses and condo's and took one. Now deciding if will extend at the condo or get a house next year.
I hace only been loving in Chiang Mai 6 months and it has really grown on me. Moved here at the right time as I started to quieten down. Still love Bangkok but only for a visit or when I worked there.
I have seen posts in other groups too. People waiting 17 days without access when they were told 3 to 5. Bangkok Bank have not exactly been a shining example of efficiency with this. Everything must be decided at HQ.
Sorry you had such a bad experience. As I said I thought when they had an IO dedicated to the DTV it was a positive and wouldbe easier to extend. Cheap Air Asia flight to Hanoi??
Was it airport or Central Fesitval? Chiang Mai is seen as a "Good" IO usually. When I heard they had appointed a dedicated officer for DTV I took that to be a positive.
PS: The Bank Certificate you mentioned is required for all longer term visa renewals Like O and B. It is valid 7 days from issue by the bank. 12 month statement also required. Banks usually charge for this in Thailand.