As to why it blocked - this is for your protection. Just like your credit card will block if you have unusual transactions abroad.
If you have paid the amount owed - this can take up to 24 hours to process. If you paid it and bars wede in the process of being added then unfortunately they will still add. Jjst call CS tomorrow or use webchat and tell them you've ppaid and they'll remove the bar.
I know it can be a pain in the ass if you need your phone for talking to people back home but it is a security measure to protect you so don't worry!