Welcome to the Community Forum and thanks for your post. I'm sorry to hear that you are experiencing a problem with your new SIM card. Is this working for you now?
If you are still having a problem with this, please let me know and I can look into this for you. I'll send you a private message requesting further details. Just check 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