Like most immigration matters, it is handled differently in different provinces.
I just underwent the process and it was a very stressful 2 months, but I managed to change employers, cancel my work permit, apply for a new work permit, get 1 year extension of stay-without having to leave the country.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.