The story is long and convuluted but I overstayed 5 days then had a flight to Singapore. Immagration police in airport said I must pay and I was happy to do so but there is no atm past security. This debacle made me miss the flight, when they took be back to beginning of security where they actually did have atms they didn’t wait for me to get the money to pay the overstay. I got a flight to Phuket on the fly same time thinking I can see them again and pay but no immigration on domestic side. This was a Friday night and Monday was a holiday. Stayed the weekend in Phuket. Came back to monsoon rain in Bangkok, travel was impossible. Took a bolt to “immigration” of course it takes me to the immigration detention center and the real place is an hour away. It becomes a 12 day overstay. I finally pay them abs have a flight to Vietnam. I get back from Vietnam and I’m way too casual about the questions so they take me to the back to interrogate me. It was a mess
my advice is the first thing you do when you arrive is to find the correct visa office and physically go there just to know exactly where it is. Rainy season, holidays, and map mistakes can all add up heavily