How are you sure this is Virgin calling you?
Sounds like scammers to me. They use robo-diallers to call potential victims & see whether a number gets a response. These calls are nearly always silent if you respond.
These calls are normally restricted to landlines, but recently more & more mobiles are suffering the same calls.
The numbers used are fake, & are either non-existant or cloned from genuine businesses & customers.
VM BB TV Landline. Vonage 2nd line. Freeview/Freesat HD, ASDA/Tesco PAYG Mobile. Customer since 1993
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