Same for my last job. My bosses and managers harassed and insulted me. They said I was useless and stupid.

I quit with 3 months of “notice” (standard in France to help you find a new job). They didn’t care during those 3 months. In the last week they panicked because they could not find a replacement that did everything I fixed every day.

Unknowingly I was the kill switch. I sent them one last email with all the information they needed and told them to go fuck themselves in a polite way.