That part of the site is "under construction".
Which is a little unfortunately as I have been capped and can't purchase another data block. Cannot check usage either.
They should have moved the old site and kept it live before testing this new one publicly.
If you go here: https://myaccount.snap.net.nz/login/?next=/summary this will allow you to access the support pages once you've logged in and purchase more data or see your usage etc.
Awesome. Thanks Benoire. Snap facebook didn't know about that.