Independent TV — poor customer care

Address:

Pune, Maharashtra, 411028

I purchased Independent TV about six months back. My set top box appears to be faulty as the channels keep getting frozen every 10 seconds and again resume after 10-15 seconds. This is interrupting the viewing continuously. Have approached Customer Care Call Centre and even written mails to Customer Care. They only promise to take action but nothing happens on ground.
My details -
CA ID[protected]
S/N - [protected]
Model DHA 042170
Registered Mobile - [protected]
They need to change my Set Top Box Urgently.