What if the rogue boss doesn't pay?

First, have you signed a labor contract with the school? If yes, apply for arbitration according to the contract;

Second, if you don't sign a labor contract, you need to prepare proof of working in the school, such as salary slips, attendance records, meeting attendance sheets, work permits, etc. And apply to the labor department for arbitration: you can apply for double salary, overtime pay and your salary in April.

Third, there is nothing to be polite about dealing with such a principal. Just use the law to protect your rights and interests.