When you add a payment method or at time of booking, we may place a temporary authorization on your payment method that will eventually be voided, and not charged.
The time taken to void depends on your bank's policy. Occasionally you may also find duplicate charges for the same amount but in fact these charges are for separate trips. To avoid getting charged and paying cash for the same trip, please check the payment option you selected before paying for a trip in cash.
Let us know, after verifying not a temporary authorization or in fact a separate trip for the same amount, if you still believe you were incorrectly charged twice.