Since, Tata Sky has been largely inaccessible oflate, you can use these sms codes to subscribe to the channels you have lost:

ADD Sports Plat: for ESPN, Star Sports and Star Cricket

ADD Sports Gold: for Neo Cricket, Neo Sports and Active Sports

ADD Life: For channels like NDTV Imagine, Zoom, 9X, Active Darshan, UTV Movies, and more

ADD LS: for the BBC channels

ADD TEN: for Ten Sports

ADD EDU: for Active Wizkids, Active Learning, and Active Sports.

Send these sms codes to 56633 from your registered mobile.  You could also choose new subscriptions or remove existing ones by going to www.tatasky.com and logging in.