parcel Parcel not received

My parcel was being delivered from Belgaum Karnataka on 10/05/2018 with consignment no. CK415317348IN the parcel reached imphal, Manipur on 21/5/2018 and it was dispatched to dimapur on 21/5/2018 but my parcel have not reach the destination yet its already 20 days, I have even visited the head post office and even called them but they did not responded well instead lied about the parcel being sent to the concern area post office but on contacting they said that they have not received the parcel. This type of inconvenience caused to the public by the office workers is intolerable. Its the worst delivery service.