It's a complete shambles. I've had this problem since November 2019.
I've managed to get the charge removed and refunded twice by Virgin, but you just have to hope you get through to someone who knows what they are doing. When they remove the charge it just gets re-applied the following month, every other time I've been told to contact Netflix.
Virgin obviously have a huge problem with security/data protection, just look at the amount of people on here who have the same problem. Virgin just say you must have signed up through Tivo or My Virgin Media.......Virgin are either incompetent or just don't want to admit there is a problem.
I've once again received my latest bill and it's got a £11.99 netflix subscription on it 😡