Welcome to the Community Forum and thanks for your post. I'm sorry to hear that you are experiencing a problem with your landline.Thank you for letting us know that you've already tried a different handset.
I'll send you a private message requesting further details so that I can arrange an appointment for you. Just click the envelope icon at the top right of this page.
Virgin Media Forum Team
Need help changing SIM card? Find out more about activating your 4G ready SIM. 4G SIM Swap Help