Human error can be both at the computer interface end. The more worrying, yet frequent occurrence seems to be disturbance of the wires in the cabinet's when they add other customers
If you would like to PM some details to me (account number, name address, daytime phone number, email and the ntl phone number affected) I can see if the forum's contacts can make any sense of this. It is a tad close to the weekend though so this won't be an instant action resolution.
---------- Post added at 16:51 ---------- Previous post was at 16:33 ----------
Details received and forwarded. Please do let us know the outcome.