Since you did not complete your RP process (Medical & Finger Print), you can resign and exit Qatar with Leave Permit which your company needs to get for you after paying the fine of QR 10 per day from 91st day until your exit date. Your visa will be cancelled automatically once you exit Qatar and you can able to get new visa from any other company and able to return without any issues and no need for any NOC.
Also once you resign your company needs to pay you all your due salaries and until your last work date & give you ticket to repatriate you since they have not completed your RP process within 3 months plus not paying salaries regularly.
You have to just tell them that if they do not clear your dues, pay fines & make leave permit you might go to ministry for complaint and hopefully they will settle everything to avoid any further issues.
Since you did not complete your RP process (Medical & Finger Print), you can resign and exit Qatar with Leave Permit which your company needs to get for you after paying the fine of QR 10 per day from 91st day until your exit date. Your visa will be cancelled automatically once you exit Qatar and you can able to get new visa from any other company and able to return without any issues and no need for any NOC.
Also once you resign your company needs to pay you all your due salaries and until your last work date & give you ticket to repatriate you since they have not completed your RP process within 3 months plus not paying salaries regularly.
You have to just tell them that if they do not clear your dues, pay fines & make leave permit you might go to ministry for complaint and hopefully they will settle everything to avoid any further issues.