Tata Sky — some of the subscribed channels are not working.

Yesterday we gave a complaint that some of the tata sky subscribed channels are not coming.
One of the tata sky customer care people had taken the complaint and after 1 hour tata sky technician reached our house. He said that tata sky setup box is not working & we have to replace it. He said setup box cost will be more than rs2000. If setup box is not working, then how some channels are coming & some are not.
Hindi subscribed channels are not at all coming. Is this some sort of cheating from tata sky.
Moreover, he is asking for service charges with out doing anything. Initially when we called tata sky customer care, they said that there are no service charges as it comes under warranty period. What is this???
I am very disappointed with the tata sky service.