@Neethu7
Only you can answer that as we are all customers of Sky here so what does your Sky bill say regarding this:
https://www.sky.com/mobile-bill
Either it was paid on the 1st or 2nd December as the 29th November was a Saturday a day a direct debit wouldn't usually be taken on or if the payment wasn't taken for some reason it might have been carried over and added to this months bill.
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