you argue with them a lot because you argue with them a lot. Much better just to do as they ask and then you will find there is a lot less arguing and they might even help you.
that is WRONG. If you want to change to monthly payments in year two you must make them during year one and keep the required funds in the account to meet the requirements if the extension based in banked money fir year one. Unless, of course. the embassy certified income in which case you can start monthly payments in year one.
I'm not going to repeat the advice given as it is good. However, if you do monthly transfers of
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baht plus for your second extension you must also keep the required amount in your account to meet the requirements of your first extension. The monthly payments must show as coming from overseas in your bank book and on your statements. I have been using Wise to Bangkok bank for 20 months and it has worked well after getting my account tagged by Wise. Also be aware that you can do what you like with the monthly transfers as soon as they show in your Thai account. Spend them, save them or send them back to home bank account if you want.
For my extension based on monthly payments I had to provide Bangkok bank statements printed from the app AND my UK bank statements showing debits correlating to deposits. I actualy did not need to get any documentation directly from the bank so it was quite easy.