How can I cancel my Non-Immigrant B visa if my employer hasn’t done it?

Ok, I'm getting confused, and I'm shutting this down.

1. Each immigration office does have slightly different policies and interpretation of the rules, so not mentioning the immigration office is no value.

2. It is (the collective) *YOUR* responsibility to cancel your extension of stay after the work permit is cancelled. When your work permit is cancelled, your extension of stay based on employment is (legally) cancelled at the same time.

3. If you don't cancel your extension of stay, there are punishments, which may include large fines.

I think the OP got the question answered. Good luck.

I had to pay 20,000 baht for 43 days overstay, because they count from the day the Work Permit is cancelled. It was the same - the visa wasn't cancelled by the employer. But the work permit was.

I just cancelled my Visa yesterday. You will need the TM10 paper from your employer, passport and work permit. You will need to copy the front page and visa pages of your passport. And copy of your work permit 1st and 2nd page.

Contact your former employer, to get your termination paperwork, contact the ministry of labor to get the proof you cancelled your work permit, take those to the immigration office and cancel your old extension THEN apply for the 30 day embassy extension

Unfortunately for you, your previous employer is not obligated to cancel your extension of stay based on employment YOU are because its in YOUR passport. :O

You need to be talking to the immigration office, the ministry of Labor (the people that issued you your work permit) AND your former employer to get the documents you need to cancel that extension..