Cancellations CANNOT be processed on the forum.
You need to call 0345 172 0046 between 1000 and 1800, Monday to Friday to give the required 30 days notice.
Wait until the messages end and when prompted say "cancel my service"
Live chat is also available from the middle of this page,
To place a cancellation you can call our Customer Loyalty Team during Business hours on 03451720046.
The line will be open from 10am - 6pm. You would need to state the reason for your call when prompted - cancel my service.