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If the company is willing to use blackmail and emotional abuse, that implies they are on the villainous side of things, making the "You are not allowed to quit" bit Resignations Not Accepted.
Making the company sorry for it is a tougher call. "I'll ruin you for trying to blackmail me" implies Pay Evil unto Evil, but I'm not sure without more details.
Edited by KD
Well the the reason the company doesnt want them to quit is because they dont want them making money for other companies but their supernaturally powerful so they start to vandalize the premise and refuse to do their job.
Is there a trope for a character who works for a company is done with them and just wants to quit and bury the hatchet but the company doesnt like that one bit. So they try to use blackmail and emotionally abusive tactics on them so they stay. That just makes them want to dig their heels in more and they make it so much harder to work with them they're sorry they even opened their mouths.