This might help to explain it:
https://www.sky.com/help/articles/been-overcharged
It sounds like the minimum term on your package has come to and end so the discount you had has now finished. When you took this out you would have been told how long it was going to last for so now is the time to call Sky to see if they will offer you a further discount for the next 24 months if you agree to a new contract.
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