That is a multicore phone cable anyway. Virgin don't use phone cables, they use coaxial cables similar to that used with TV antenna feeds.
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Welcome to the Community and thank you for posting.
I am very sorry to hear you have not been able to complete your self installation, we will be able to help.
You will need to have a technician visit to get this completed so I am going to need to take a few details via private message.
I'll pop this over to the purple envelope on the top right of this page and we can go from there.