makes sense
It is an amount blocked on your credit card by the merchant. The funds get debited to you, but are not credited to the merchant. This amount is just blocked against your credit card as a security during the entire duration of the trip. Once the Matrix SIM / data card is returned, the amount gets released automatically in 21 to 30 days; depending upon the financial service provider. The actual transfer of fund takes place only post-charging for your bill generated. The authorisation transaction does not reflect as a charge on the credit card statement.