Inquiry for cancellation of visa

Hi my name is Jhun from Philippines. I've just renewed my multiple non b visa for another year but unfortunately we had a misunderstanding with my company that makes me quit the job. I just want to know if the employer can cancel my multiple non b visa? I've already returned the work permit to them and they said they will also cancel my visa. Is it possible for my employer to cancel my visa?

Thanks in advance for the answers.

I think if work permit is linked to b visa they most likely can cancel.

Is it same to assume they obtained the extension on your visa?