Tata Sky — tata sky cancellation process

Address:	Gautam Buddh Nagar, Uttar Pradesh, 201301
Website:	Tata sky

I have been using tata sky since past 8 years and on cancellation they are troubling they are troubling their customer. My account has credit of 700 rs and want to cancel since i have moved out of country but now they are saying that they will refund if i will return their device. Since i m no more at that place and i wont be able to return device, they are going to eat up my money which is shear # policy for tata sky. Did i paid 2300 bucks just for ibstallation? Please suggest.