I would like too give 30 days notice

See

https://www.virginmedia.com/help/leaving/

If you disconnect within a minimum term period, VM will charge early disconnection fees.

Hi there, 

Thank you for your post. We're sorry to hear you wish to cancel with us. 

Do you know if you are in or out of contract? If you are out you can call into the team via 150/0345 454 1111 and they can look at available offers to renew.

^Martin