Dear Srinivas, certainly, it is a harsh blow to an employee who has served an organization diligently for a continuous period of 30 years when he is suddenly asked to resign by the employer. At the same time, you have to evaluate certain aspects of the situation dispassionately.
Considerations when a company shuts down
First, when the company shuts down its branch and is not in a position to offer you employment elsewhere (which should also be acceptable to you), it can retrench you, for which it has to pay retrenchment compensation at 15 days' wages for every completed year of service. Either out of difficulty or to avoid such an additional payment, your employer might have asked you to resign on your own. Since you had been an accountant in the organization, you might be well aware of the actual position. In order to circumvent the legal provision relating to retrenchment compensation, knowing well that you cannot comply with due to your personal difficulties, they may transfer you to some other branch. Then you would be compelled to resign.
Considering the age of superannuation
Second, assuming that the age of superannuation is 58 years, you have only three years more. If continued in service, after retirement, you are going to get gratuity only as a terminal benefit. Therefore, your employer would not be prepared for your voluntary separation under any scheme, which normally would apply to employees above the age of 40 years with a minimum of 10 years of remaining service.
Under the above circumstances, you may choose not to resign and ask them to transfer you elsewhere or retrench you with retrenchment compensation. Alternatively, you can request the management for some extra amount as an additional terminal benefit in view of your service and family situation.