Package changes can't be dealt with via the forum, and you do need to call in to do that - just use the "thinking of leaving us" options, the chat-based methods aren't real-time and calling can sometimes be (ultimately) quicker.
If you decide on outright cancellation, you also have the option of writing in as per https://www.virginmedia.com/help/cancel-virgin-media
Cancelling your direct debit won't cancel your contract, but is very likely to cause issues with your credit file. There are numerous examples on this forum of that not ending well.
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