Tata Sky — suffering from No signal... please contact

I'm Tata Sky since last 7 years but this very pathetic kind of service I am getting now a days. Past 5 days I am unable to view any channel and receiving the same message i.e. No Signal. I have also filed the complaint regarding same and after 4 days some one has took the pain to attend it but after visiting his reply was another shock for me because according to him now my Set top box is not working properly and it needs to be changed.. please help me . my ID is [protected]