Hi, Once officially relieved from the services of the company, the employer-employee relationship will not be applicable. However, considering the roles and responsibilities of the employee, the employee may agree to support remotely based on the request of the employer. Further extension may be requested but cannot be demanded.
In your case, the actual last working day is 31.5.23, but you were relieved earlier, maybe based on your request, I presume? In such a scenario, your support on a remote basis until 31.5.23 makes some sense. However, further extension cannot be demanded. Also, the salary will be calculated until the last working day only. So, on mutual understanding, support can be extended but cannot be insisted.