Had the same before… you can contact me i can tell you exactly… depending what immigration issued your work permit…you have 7 days to leave the country.. there is no other way… i went cambodia came back on a tourist found new job then they can change from tourist to non b
First day overstaying is free of charge ( at least for me was like that) normally they do like that… bkk immigration… but better not coz more annoying then paying isto wait at the line there … takes forever