0800 561 0061 is an automated service that will tell you of any issues down to the postcode level.
There have been a handful of reports of this number not working in the last couple of days though- seems VM are having phone issues...
if you get the all clear from that number then you’ll have to call the service desk. It opens at 9 this morning, try to call as soon as lines open, hopefully your wait will be shorter.