Our support line is in the footer of every page. It was on the contact page and nowhere else, so you had to find that page first. Call +44 7576 569444 from anywhere on the site, or from the footer of the sign-in page if you cannot get in at all.
What the line does is written down properly. Our support and SLA page now lists the phone number alongside the other ways to reach us, and the telecoms policy explains what happens when you ring us: the line is answered by a digital assistant, the recording notice is read out and cannot be switched off, you can ask for a person at any point, and if nobody is free we take your number and ring you back rather than leaving you holding. It is a standard-rate number and never a premium one.
One correction while we were there. The contact page described sign-in codes by text. That option has been withdrawn — see the correction on the 13 August update — so it no longer says so.