How can I change the account email address without access to it? I am at wits end.

Can someone from virgin media please help I am at my wits end. The email address used to access my account is now defunct and can't be reinstated. To change the account email address the VM system requires... access to the old email inbox. The only email change process sends a verification email to the old address.

How can I change the account email address without access to it? I keep being told I’m reaching maximum security questions after only 2 attempts and at this point I just want to cancel my account but cannot do so due to the email issue. How can this be resolved??