They've probably have been forced out of business, several suppliers have been. You'll have to look at finding a different supplier and make sure that you cancel your direct debit or credit card payment, as Sky will have sent out the card to the registered address by now, and your existing card will eventually stop working. There will be a house or small block of flats with a huge pile of envelopes from Sky, containing update cards, their churn rate immediately after the full switchover to new cards may be huge.