If debited when attempting to top-up your Carbon account [wallet] via your ATM card but the said transaction failed, contact the card services unit of your bank after 24 hours if no reversal was automatically done and fill a dispense error form for a possible reversal
If debited while attempting to fund your carbon account [wallet] via direct bank transfer from your bank and your carbon account [wallet] does not get funded within 3 hours. Contact the sending bank or institution for further assistance.