Question: Can the issuer levy late charges on reversed transactions that were later credited back?
Answer: No. Interest and related charges should be computed on the outstanding amount after adjusting payments, refunds, and reversed transactions.

Supporting evidence:
title: rbi.org.in/BS_ViewMasDirections.aspx
quote: Interest shall be levied only on the outstanding amount, adjusted for payments/refunds/reversed transactions
context: s and other related charges, if any, only when a credit card account remains 'past due' for more than three days. The number of 'days past due' and late payment charges shall, however, be computed from the payment due date mentioned in the credit card statement, as specified under the regulatory instructions on 'Prudential norms on Income Recognition, Asset Classification and Provisioning pertaining to Advances' amended from time to time. Late payment charges and other related charges shall be levied, only on the outstanding amount after the due date, and not on the total amount due. vi. vi Interest shall be levied only on the outstanding amount, adjusted for payments/refunds/reversed transactions. vii. Changes in charges shall be made only with prospective effect giving prior notice of at least one month.

If a cardholder desires to surrender his/her card on account of any change in charges to his/her disadvantage, he/she shall be permitted to do so without levying any extra charge for such closure, subject to payment of all dues by the cardholder. viii. There shall not be any hidden charges while issuing credit cards free of charge.

7. Billing (a) Card-issuers shall ensure that there is no delay in sending/dispatching/emailing bills/statements and the customer has sufficient number of days (at least one fortnight) for making payment before the interest starts getting charged. In order to obviate frequent complaints of delayed billing, the card-issuer may consider providing bills and statements of accounts through internet/mobile banking with the explicit consent of the cardholder. Card-issuers shall put in place a mechanism to ensure that the cardholder is in receipt of the billing statement. (b) Card-issuers shall ensure that wrong bills are not raised and issued to cardholders. In case, a cardholder protests any bill, the card-issuer shall provide explanation and, wherever applicable, documentary evidence shall be provided to the cardholder within a maximum period of 30 days from the date of complaint. (c) vii Card-issuers shall provide the list of payment modes authorised by them for making payment towards the credit card dues, in their websites and billing statements. Further, card-issuers shall advise cardholders to exercise due caution and refrain from making payments through modes other than those authorised by them. (d) No charges shall be levied on transactions disputed as ‘fraud’ by the cardholder until the dispute is resolved. (e) viii Any de