This is absolutely a scam of a plan, they send you notifications if you go over the data through unknown numbers so you actually never receive the notifications, they don't send you emails about it - nothing. Customer service is terrible, they're not willing to help and just say its your fault but theres no option to stop the data once you've gone through it. I cancelled my plan too, paid in advance, and then they charged me again and cancelled my account but didn't remove my card. The amount of problems I've had with Virgin is insane, I never dealt with these problems with other service providers.
I would never recommend this plan to anyone, please be aware, they will eat your money like crazy!