illegal perrsonal info extracted of govt employee

If the information is stolen from the Mobile phone of the aggrieved party it amounts to theft punishable under the Indian penal code as also under Section 65 of Information technology Act,, 2000. IT Act provides for prosecution of the offender and on conviction, he will be punishable with imprisonment up to 3 years or a fine which may extend up to Rs. 2 lakhs or with both.  

According to my knowledge, the responsibility and violation were of those officials that provided such personal information held by them in a fiduciary capacity and we can not hold a third party responsible for getting that personal information.  However, as the information seeker is a public servant and used his personal capacity by misusing his official position, a complaint can be lodged to the Inspector General of Police or online grievance portal.

Why a police constable shall collect information which are irrelevant for him / her? Unbelievable.

However, if someone has taken your (not someone else) personal information unautorisedly and illegally and you came to know that so and so has taken your information, file a complaint to area SHO, DCP / SSP.

If no action is taken by the police file a complaint to area Magistrate through a local prudent lawyer.

Agreeing with experts above I can add that for further advise you should narrate facts of the case.