Thanks for posting and welcome to the community.
I am sorry to hear of this email issue. Have you been able to follow pjh's advice regarding this matter? https://www.virginmedia.com/help/security/why-is-my-virgin-media-email-hacked - this should also help you in this matter as well.
Please keep us posted if you need further help.
Need a helpful hand to show you how to make a payment? Check out our guide - How to pay my Virgin Media bill