That is account related so you should call 211. Prepare your billing statement if any for your reference.
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Outstanding Balance is the sum of the charges which have not been paid yet (or not reflected as paid as payment may have been made after the due date).
Unbilled charges are the charges for usage but have not been deducted yet from your allotted consumables or promos which were included in your plan.
@firstname.lastname@example.org Outstanding Balance is an unsettled bill or set of bills (from previous billing periods). Unbilled Charges are charges for the current billing period (not yet adjusted based on your Combos, Boosters, PV).
For more information on how to read your bill, please visit: Bill Tutorial | Billing | Postpaid | Help and Support
For a more detailed breakdown of your bill/s, best to forward your concern to Twitter Specialists or Hotline CSRs.