The reasons may be different. If the number WAs restored by making a payment after being blocked by the limit during the month, the sum of the bill WAs more. We should also inform you that the financial information in the postpaid system is updated every 4 hours and it is possible that expenses may be incurred before the update, as a result of which the account will exceed the limit, note that it is updated later in the roaming zone. It should also be noted that VAT is not included in the presentation of current expenses.