Hi Lavanya
1. you immediately issue him a charges, stipulating charges such as a) indiscipline, b) negligence, c) recklessness, and ask him for explanation with in 48 Hrs from the date of receipt of the charge sheet, for his irregularities during his notice period, which a most crucial period for the management, where he have hand over his total responsibilities to a newly appointed employee in his place of work.
2. Wait for his explanation and if he fail to do so, teach him a lesson, by issuing him a legal notice stating, to explain why the management should not take action against him.
3. If fail to submit his explanation even then, you stop issuing him re leaving letter and experience certificate and also with hold his full and final payment.
4. You also advertise in leading News papers citing his irregularities so that, the other employer would come to know his character and conduct. If you know his new employer, you write a letter to him too, stating about his above charges.
A employee can resign and leave his present service, but he ought to move with smiling face, and giving no trouble to the employer, and behave with moral. We do not know what is tomorrow, we may have to take the same employer help some day or other, this is life, hence we have leave the service with out pinching the employer.
Mohan Rao
Manager HR