If you follow the instructions here is should tell you who to return it by, usually it is Royal Mail:
https://www.sky.com/help/articles/return-tv-broadband
Add a note inside with your account number and a list of equipment you have included.
Make sure you get and keep proof of posting when sending this off.
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If someone has helped you then please click on the LIKES button in their post.
If you need help please provide as much information as you can
