@Mattbate
You might be able to do this online here:
https://www.sky.com/mysky/tv/tv-packs
If not and you pay Sky for access to the TNT channels then you need to contact Sky and give them 31 days notice to cancel it, so you can either call or use the messaging service to do this.
https://www.sky.com/help/articles/cancel-sky-tv
Select "No, I still need help" at the bottom of the page on the above link.
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