India Post — Article not getting delivered

My letter is moving slower than snail pace. I had booked it on 17th july. And letter still not left for destination city. It seems stuck in kolkata. Till now it was supposed to delivered. 2 weeks has been passes still no sign of movement.
Registered a complaint on its website but no reply from there also. If they were unable to deliver they shouldn't have booked in 1st place.