First of all I would like to tell you that what you wrote here is disrespectful to Thai people. Only my opinion!
Not in my case, because I really have no assessable income. My income is exclusively from a state pension. I know that and the tax authorities in my area revenue office know that too. In a 15 minute personal talk in his office the lawyer there also showed me the relevant legal text in the DTA, which I already knew. So in my case it is not a lack of knowledge about their tax rules. I think it's more the lack of guidelines for my specific case. I am not happy with: "Keep records and wait and see"!
My attempt to get his name and something in writing was answered by saying that I should ask to the area revenue office in writing. We did this in Thai language a few days later. After 3 months and several inquiries about the status, I received a written reply from the regional revenue office. Unfortunately, this did not help me either, because on a whole page only my personal details were repeated and it was confirmed that especially my income is exempt from tax in Thailand. My main question was, if I can get a TIN and have to file a tax return even though I have no assessable income. I didn't get an written answer to that question, but my area revenue office refused to give me a TIN because I have no assessable income.
After I got this letter from the regional revenue office in August 2024, I wrote an email (attached my correspondence with the regional revenue office) to the Revenue Department Bangkok, to get an answer to my main question. No answer. To date I wrote 4 emails at regular intervals, but have not received a single reply!