1. Apart from your supervisor, have you submitted your resignation letter to the personnel department? If not, your supervisor denied receiving your resignation letter, or did not accept your resignation letter, then you can't prove that you left the company one month in advance. Your notice of resignation must be signed by the company. If he doesn't sign for it, he will send it by registered mail or express delivery, so as to ensure that there is evidence of delivery notice.

When you sue him or arbitrate, first look at whether he has violated the law. If not, it's just your resignation. If you have no evidence to prove that you told the company 1 month in advance that you want to leave your job, it will be difficult for the law to support your request. Maybe the company will counterclaim you for breach of contract. If the company violates the rules, such as not signing a labor contract, not paying social security, defaulting on wages, etc. You can leave your job because of its violation, so you can immediately give reasons to resign and leave if you want.

I suggest you communicate with the leaders more. If the company insists on the procedure, you should write your resignation letter from now on and formally submit it to the personnel department and your competent department, and explain your specific departure time. Please ask the company to arrange someone to take over the job. If no one takes over your job at the end of your resignation, it is deemed that the company does not need to take over. Remember to ask the person who accepts the resignation letter to sign it as proof. If the unit violates the rules, you can leave your job on this ground and talk to the unit. I believe that if he breaks the rules, he will let you leave as soon as possible.