International calls are usually billed the first week of each month. If there is a lot of usage on an account we'll typically 0 it out sooner.

The credit balance is applied to any automatically generated invoices. It likely wasn't on the extension since that was a manual transaction. If you contact us we can arrange to apply it/refund part of extension or you can leave it for auto generated invoices (including international).

We have a new billing system launching by the end of the year that is all real-time and will show "pending charges" like international calls live.