Got mine at bang on 9:00am using the code from the email. If you didn't get the email you might not be signed up to their mailing list, that's all I can think of.
It seemed quite organized to me, they had a code in the email, one on the WWZ website, one on the Muse Twitter and one on The Sun. They pretty much told everyone like 4 days beforehand from which places you could get tickets from (except The Sun), you can't blame them if others were faster than you were. Just my opinion.