ebay don't police the stuff that is on there for sale. ebay are just after the seller advert fees. I hope you can get a refund, but I wouldn't hold your breath. As with everything it's buyer beware
The terms of service of cable state that customers should return their kit to Virgin, or it should be disposed of at a proper facility. They prevent resale, but people don't read the small print of their terms of service.
More to the point unless you are subscribed to cable services, and using the kit that is being supplied to you by Virgin Media, you are in breach of any terms of use and may be commiting crime by obtaining services without payment.