Resignatiom

Can any govt service has right to not to accept the resignation letter of an employee, who does't want to do service, by stated that "due to shortage of manpower we can't accept your resignation".
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if Yes, then Is it not unconstitutional??

They cannot adopt military rules ,it is unconstitutional if it is shortage then it is the duty of govt to appoint in time to time thru proper appointment s.

Sir, Is it applicable on coast guard, the organisation follow CCS rules?

Sir I will put my resgination