Just saw your messages on the O2 forum thought you might be able to help.
Im trying to register a new sim card for free credit for a few days now and i keep getting an error 404 message when clicking the �Call credit values� link under �Claim call credit�
I have had a look at your account and it was registered on the 16th of this month. It takes a maximum of 72 hours for your registration to complete. As a first time connection once you have registered on the website you have also registered for your free credit after that for any following upgrades you need to log in to claim it.
There is definitely a problem there alright since you still have not received your bonus credit. I have registered your details again. This might not be live with the website but you should start to receive your credit soon. I will keep an eye on this for you over the next couple of days.