1) New customer - wanted to use old modem/router
2) Call centre rep was telling us the username/password to use.
She then dug deeper and found the username was spelled incorrectly from what she was seeing to what it should have been.
3) In the end we had to give up - logged into the pre-programmed vodafone supplied router and found the incorrect spelling of the username, but also the password she was telling me to use was completely wrong - 8 digits instead of the actual 4 digits.
So it seems whatever software the front end was showing the CSR, the back end radius server was using completley different credentials and they didnt match up.