The agent will go to the bank solo with your passbook deposit the funds, get the letter. Then come out and instruct you to send the 800k back to his account using your phone app.
Note this is accomplished by the agent passing cash under the table to the bank employee.
And now you are forced to use the agent to validate your account again for the next extension assuming you deposited the required 800k immediately following the agent actions and leave it there the required time the balance of the first year.
You can use an agent to do the paperwork and use your 800K transfer to avoid getting stuck with that agent in the future.
My 1st year I had the 800k ready to transfer but the sneaky agent did the deposit using their funds and withdraw immediately following getting the letter from the bank.
I did the transfer of 800k immediately into the account and left it there all year. I then used their funds agent the 2nd year but no funny funds transfers to validate my bank history for the year.
I did it but I left the entire 800k all year and also made the monthly deposits. This IMO is the safest way to approach switching in case the 65k method does not fly. Some people have reported that certain Immigration office have flat out refused to accept the 65k monthly method.
BTW I did the extension renewal at Bangkok Wattana immigration and they did not like it and tried to convince me not to switch.
I did go to kbank with the detailed receipt from Wise and requested the ‘credit advice letter’ the following is what I got.
BTW I have already requested and received the ‘credit advice letters’ from Bangkok Bank for months May thru August. And doing all transfers to Kasikorn bank for the balance of the 12 months