Cancellation is not a refund. Normally, in case of cancellation the customer should not see any transaction on his account. However, some acquirers immediately debit the customer's account virtually upon request for authorization. This is the case of prepaid cards for example. The cardholder’s balance is not updated in real time after cancellation and the restoration of the amount can take up to 30 days depending on the type of card.
To cancel a transaction, see the article “Cancel a transaction from the Merchant Back Office”.