use your phone, put it in your top pocket camera on. make low profile, smile, go home save the movie on a cd with word page explaining the behaviour of the officer, sent it to the imm. comnander in bkk. done
i think you will not get a correct answer here, better try differents lawyers. or maybe a foreigner lawyer at your embassy could help. In TH lawyers are not at the same "level" than in developped countries, most are even of low competance...