Airtel / Airtel dth HD set top box
No Dolby digital sound

We purchased Airtel dthHD set top box. As per the product detail, it has to deliver Dolby digital surround sound but it is not delivering Dolby digital sound. I made aware the Airtel dth HD about this problem which I m facing from day one of it's installation. I request Airtel dth HD to resolve this as soon as possible. But they are not giving the services for what they are charging.

I request you to look into this matter.