Tata Sky — Change of mpeg3 to mpeg4 set top box

Address:

West Champaran, Bihar

I had registered a complaint before 25 days regarding the change of mpeg3 to mpeg4 set top box. Called customer care more than 15 times. But they are not taking any step for that. What should I do now? The agent who has the duty to change set top boxes in our area is telling me that my set top box has already been changed which is not true. And he is not ready to change that and telling me that it will be charged 1800 rupees. I am fed up of all these. There might be some fake report submitted for change of my set top box. Please kindly change my set top box as soon as possible so thatI can se all the channels