Hi I have the same unresolved problem.
Just spent another hour talking to customer support.
I've tried the links and get either DEF01 or sorry to see you go.
I've tried a new email address just for VM and that doesn't work.
Cleared cache, tried Chrome, Firefox & Edge browsers.
Is there an email address to complain? I'm done with VM. No idea what my bill will be, haven't received any direct debit info.