This will need to be done via customer services unfortunately, the best way to reach them without a lengthy queue time is at 8am by calling 0345 454 1111 options 1-1-4-4... you may well get a nice offer for the broadband service too.
If I've helped let me know 🙂
10 year's managing 9 Virgin Media accounts, and things never got any better, closed last 4 accounts since January 2021 :L
I give 'my' experience to help where possible.