I am sorry to hear that your landline isn't working right now. I have carried out a line status check remotely and no error has been detected. Given you have checked another handset already I will be happy to go ahead and arrange for an engineer to call round. I will pop the details in a private message for you. Look for the above.
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Thanks for coming back to Craig in your PM to confirm the line is all now working
In relation to your other question in the PM about the V6 upgrade, if this doesn't work for you then if you can get in touch with our teams via Webchat or on the phone they would be able to put in a work around for you.