Dear Anindita,
As mentioned by our elite members, the issuance and acknowledgment of the appointment letter by the employee are essential, which will be useful in situations like yours.
The appointment letter will clearly specify the notice period for severance, agreed upon by both the employee and the employer.
In the scenario you have described, there is little that can be done if the employee continues to work for another organization. Please understand the intense competition in industries where competitors may seek to destabilize each other's workforce. Therefore, the organization where your former employee is currently employed may not prioritize obtaining his relieving letter as long as he remains with them. It is possible that the new organization has taken measures, such as a bond agreement, to retain the employee for a specified period. Consequently, the previous relieving letter may not hold much weight.
Additionally, please confirm if you have acknowledged his resignation letter and provided him with your acknowledgment. If there is no record of receiving the resignation letter, you may consider his absence from work as unauthorized and initiate disciplinary action accordingly.
To address this situation, you may withhold his unpaid salary, Full and Final Settlement, Bonus, etc. Furthermore, you can notify his current employer that he has not completed the handover process and is working for them.
By taking these steps, the most you can achieve is withholding any outstanding amounts due to him. However, it is important to recognize that you cannot compel him to return to work as before.
Please contemplate these points carefully.
Best of luck.
Regards,
Dhinakaran