You could try pairing the remote to a different make TV to see if that works, I remember someone removing his soundbar by just saying no to everything, don't know if it was the volume keys test.
Welcome to our community forums and thank you for your first post.
Sorry to hear you are having issues with your TV as well as your Sonos. We want to do our best to help. Have you tried the advice given by @roy247. You may also find the following link useful https://www.virginmedia.com/help/tv/using-your-remote and https://community.virginmedia.com/t5/Virgin-TV-360/Unpair-my-360-remote-with-my-samsung-soundbar/td-...
Please let us know if you need any further help.
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