Trackon Couriers — Misplaced of my parcel

I sent a parcel from aurangabad ( bihar ) to Bangalore ( Karnataka).But it doesn't received by the receiver and the current status is showing that it has been already delivered.I asked the trackon courier agent who has placed my order about that but after 2 months has been gone they didn't reply.I asked them several times but i disappointed. Please take a serious note about my issue or i have to go for a legal action.
Thanks