India Post — demand of money for delivering of letters

Address:

801505

Every time postman while delivering letters /speedpost/parcels etc. Demands money (Like as it is their right). On denying the amount, postman from next time didn't deliver the letters, either he'll return it or keep it with himself. Kindly provide some measures for such corruptions going around us on daily basis. I also complained about him to his office but no any action being taken and the things continues as before.