They are open 9am till 7pm on the phones, but you could try Chat - they will close by 9pm, and normally need to call back, so you still need to be available for a call during opening hours, @Spoon79.
You have not made it clear what the circumstances are - did you originally set up an upgrade anyway or was this from an offer from Talktalk that needs stopping?
Either way, whatever the details, cancellation can't be done through the forum. If you want staff to check it's been processed, you should return to the "help with your service" menu and choose the appropriate message board, then click on start a topic.
This is an old thread and is not in the queue for staff attention.
Gliwmaeden2, a fellow customer.
