Welcome to the community and thank you for getting in touch.
Call barring is a feature that we add at the request of a customer. We can remove this feature from the service or a pin can be set up on the line to override the service which will allow you to make a call. Information on the bar feature and how to set this up can be found on page 8 here
If you would prefer to remove the feature from the service, please let me know and I will get this arranged.