I did. Had an 8 - 12 appt but didn't get seen till 2:30pm
No matter where they seat you, especially outside, always move to the closest seat to the front that's empty... I learned the hard way and people that arrived after me left way before me. Eventually I just got up and made my way in myself, otherwise I might still be there now 🤷🏻♂️
Went to chiang mai Airport office for a 60 day extension to my tourist visa based on thai child, they redirected me to the mall office to get 30 day extension to tourist visa. They asked me about embassy letter which I didn't have, I explained that the other office sent me over and they stamped my visa. Not sure if having my son with me made a difference 🤷🏻♂️