VM have their own exchanges & network, so its nothing to do with BT. There is a crossed line either at the local cabinet or further back so you need to inform VM ASAP so they can get an engineer out to look at it. I would also carefully check your bills in case someone else is using your number
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile
Welcome to the Community, I'm really sorry to learn about the problems you've been experiencing with your phone line lately.
I'd like to arrange for this to be looked at for you, I've sent you information regarding this in a private message. You can view that message by clicking the red envelope on the top left of this page.
Sorry again for the inconvenience this has caused, we're looking forward to getting this sorted.