Makro not refunding cancelled order in full

On 23 September 2023 I ordered from Makro online two related items (R3411.78 and R331.79 respectively). On 26 October the transaction was registered on my credit card. By 5 October I have not yet received anything. When I enquired I was told that they are cancelling the order as there was no stock (yet the online catalogue still reflected these items with no indication that they are out of stock!). On 12 October 2023 the refunded me the amount of R331.79 - the lesser of the two items. Since then I have emailed and phoned them numerous times and they have each time promised that the matter is rectified and that the money should reflect in my account within days. Yet, till date I have not received the R3411.78 they still owe me. Is this *****? I have read all the complaints regarding not getting refunds from the people and it seems that there is a serious problem.... Maybe we should persue the class action suggestion?