Tata Sky — Charge amount for hd channels for one year and deactivated in one month

Address:

500015

I am a Tata Sky viewer, in the month of November 2015 we got upgraded our set top box to HD channels, during this festive period we were told to pay Rs. 1500/- for set top box and the HD channels will be FREE for one year.
there after in the month of February first week our HD Channels were deactivated saying there is no balance in the account, an amount of Rs 502/- was also deducted for the said HD Channels.
Since February 10th 2016 we are complaining to customer care but in vain.
The complaint no is NSELN7U
Thanking You