@Max ************
if it’s not a an official procedure, what is? I asked them the question, because as you know, you need to open a bank account to apply for your extension and the bank won’t let you unless you have a visa. So I asked them how? That’s what they done for me cost 500b , the bank got their rules out for foreigners after
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minutes of checking, went ahead showing yellow book, pink ID, passport, marriage certificate, immigration letter. This was my first attempt to open a Thai bank account and I done my visa extension myself also, I didn’t know what to expect or really do, but got my ducks all in a row and ask the people you are dealing with.