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Ask the agent for help setting up an account. If they're interested enough in your long term, extension to stay, business, I would hope they wouldn't charge for helping out with setting up the account. Another option if you decide to go with Maneerat, they use the Bangkok Bank branch on Beach Rd. You could stop in at that branch office, explain you'll be using Maneerat and ask them to open an account for you before engaging the agent's services. Edited to add: Coincidently, just read on another forum a guy who did what I had suggested, asked the visa agent for help to open an account

Well you are paying more for an accommodation that we all know is a a bit shady. The branch at the top of soi 6 is the one I have always heard of, but you have to imagine the one near immigration, just up on 2nd Rd, is in on things. You might have to buy insurance!

Bangkok Bank seems to be their preferred bank for about the last year. They will still do it with a Kasikorn account but it will cost 14500 baht versus 12500 for Bangkok Bank. No idea about other banks.

Are the flights on the same ticket /same ref #? Golden rule is that they wont issue if outside the declared transit time minima for the airport. (& and of course because they pick up costs if they fail)