@ Bijay Raj Mahajan ji: Sir, there's no question of defamation when the complainant is not even naming anyone.
@Rahul Das: What I said was make a complaint AND don't expect police action. The police neither have the time NOR the cpapability to go on a wild goose chase of a suspected data theft. But when you give a complaint in writing to the police today, get it stamped with a D.D. entry number, you'd have a record, a continuity in the chain of events, if and when in future the data theft of your case develops further.
Right now, you could give a complaint with particulars why you think data is being siphoned. Of Course, police has better things to do that go on your hunch. So just get that complaint on record; point being continuity from the first instance that you suspected data theft.
If the data theft leads to further crime tomorrow, the prosecution might ask why did you not report it before? And to that, you'd have an answer that you did.