Triple verifications done with Thai immigration and 2 agents: O-A renewal requires a Thai medical insurance cover to be issued by one of the 14 companies listed in the official website! Contacted around 10 of those companies, of which 80 % do not deal with people being more then 75 y.o. Finally decided to fly to Hanoi (land border being too tiring for old person), and come back one day later with tourist visa exemption one month, so to apply for non O visa with agent at a cost of
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B! ...all about π°