Poor Customer Service

I am writing on behalf of my husband who is receiving the bad end of the stick with FNB card division. On 25 February 2021 he made a cash deposit via ATM. The money was automatically transferred into his credit card which is supposedly linked to his cheque account. He received an email notification advising him of the successful deposit. However each time he checked his bank statement (cheque account) the money was not reflecting. He subsequently went into a branch to query the transaction and was then informed that the money was deposited into his credit card. The consultant very efficiently assisted and referred him to customer services as there was nothing the branch could do to assist. Numerous emails have been sent and received via the card division and each request they had made was fulfilled by my husband. To date, he has not received a reversal of his funds despite numerous attempts to rectify the situation. Please help.