I'm sorry to hear that you've had a lot of trouble trying to reach us recently. I can confirm that both 150 and 0345 454 1111 are still active numbers, however we are aware that the queues are a lot busier than normal which can sometimes cause issues with new calls connecting. We know how frustrating this is and we're truly sorry.
Is there a specific reason why you're looking to cancel your landline service? Sadly this isn't something we can help with over the forums, however if you're unable to get through over the phone, you can text us instead on 0753 305 1809 and our team can help you with this.