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Looks like an issue where the database hasn't been updated properly. Maybe the engineer who checked your cable didn't get the records changed after he checked things.
There can however be issues in blocks of flats with serviceablilty, even if the cables are present. Even if the cables are adequate, it may be that somewhere in the system there isn't enough capacity for the additional boradband / digital (are others in your block actually on digital TV or is it analogue?). If additional cables are needed that's where ntl can run into problems with easements and the like.
We can ask the Cable Forum's ntl contacts to have a check on this for you. Please PM me your full address including postcode, daytime phone number and an email contact.