4G connection seems fine, but it’s not logging you in to the network. It’s redirecting you to a log-in page, but the server on which that page is located is responding that the log-in service isn’t available (this communication could explain part of the data you’ve actually used, but of course the connection is otherwise pretty useless).
If your network normally doesn’t require a login/first time setup procedure:
Double check your APN for login details. Check your provider’s website or the SMS with service settings that they usually send when the SIM is activated. If user/password is not specified, make sure the fields are left empty. You mention that SMS is working: there’s usually a way of requesting the configuration SMS again, if you didn’t receive it or if you want to reset then APN to the settings recommended by your provider.
Try a 3G connection instead to be sure that this isn’t some weird two-tier network thing
Check with your provider whether your data plan has been activated.
If they do require going through a login procedure, check with them whether there are any issues with that service.