I am currently working in a PSU government organization. I submitted my resignation letter in March and began serving a 3-month notice period. After 20 days, I left the company and later applied for a one-month leave for personal reasons. However, I returned after 5 months to complete the remaining notice period. Now, HR is stating that my relieving date has passed, and I need to file a fresh resignation and serve another 3 months. Is the first resignation relapse a thing? How should I proceed?