Videocon Industries — continuous crackling sound from d2h set top box

Address:

560040

Over a few weeks, we observe a terrible crackling noise in all the channels. Despite my multiple complaints to the customer support, they force me to check the connectivity often, which I found to be good always.
Everytime when i call customer care they are not even bothered about solving issue rather they ask me to check the cables and if the device is plugged properly, which is well connected.
My customer ID:[protected]