Tata Sky — Promised credited days not received

I purchased Tatasky HD(Subscriber Id: [protected]) on 12-Feb-2015. On 03-Apr-2015 it stopped receiving all HD channels as well many other channels. I came to know from there adv that they are upgrading there systems. They asked to send an SMS 'NS' to 56633 or give missed call to [protected], from my registered mobile number. I did the same on 04-Apr-2015 and received SMS from them saying "Your Request is under process, you will receive the response shortly". After this I daily received SMS from them saying that my request is in queue and my account is being credited by three days. The issue got resolved on 15-Apr-2015, but I didn't received any credit as promised by them. I tried to call on there help line numbers, [protected] and [protected], but again was asked to wait because all there representatives were busy. These are not toll free number and I have already wasted around 150 Rs calling on them.I tried to call late in the night but even at that time they were busy.