Ring Sky to cancel they will then go through a process of offering you various packages at slightly reduced rates, keep saying no until you get through to retentions who will no doubt beat whatever the previous advisor was offering.
If the deal they offer is attractive enough for you then happy days if not go ahead with the cancelation as within the next month you will receive several letters through your door begging you to come back and offering you various discounted deals.
Or bin it off and just get Youview or similar ,that’s what I and several others on here have done and I don’t really miss Sky at all.
The odd shows I do miss I stream via t’internet but that’s a different topic again.