The £20 Social broadband tarif is for the M50 broadband, but it doesn't include the phoneline, so if your contract doesn't show the phoneline then it's the correct Social tarif.
I'm wondering if the extra £8 is a one off as you've changed package partway through a billing period.
https://www.virginmedia.com/help/package-change
It would be helpful if you could post screenshots, but blank out any identifying information such as your name, address, account number or email address.
DaveI don't work for Virgin Media.
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