Unacceptable service at Makro Centurion

On 05/10/2021 my wife bought 6 t-shirts from Makro Centurion. When fitted at home she found them too small. On 06/10/2021 I return them to the store to exchange it for a bigger number. At the returns counter I was issued with a voucher to use at the pay point. The store was out of stock with the bigger number and my wife advised me not to take the garments. I bought some other stuff in the store and when i want to pay, the attendant (Fhuluvhelo Luvhengo) informed me that she cannot give me change since the amount I bought for was less than the amount on the voucher. I asked het to resolve the issue. First she called a supervisor which told me to go back to goods returned. I refused to do so and just ask for the change to be paid out that I can go home. After about 30 minutes a guy came there telling me that he will assist me. He asked for the receipt of the previous day and my banking card which I used to paid for the t-shirts. Then he (Lwando Matiwane) informed me that this is not the same card that I had paid for. Obviously an argument ensued. He insisted that I must call him stupid. I did not call him stupid. I told him not to be stupid, since I only have one banking card and that is what I use to pay with. He stood there and writing something down and then turned around and telling the supervisor to continue with the transaction and pay the change out. Now this messing around by Makro's BBEEE staff is totally unacceptable. I was told at goods return that I can redeem the voucher at the pay point for cash. I am taking exception to the way this incident was handled. If they pay out the change in the first place there was no incident or need to do this review. I will have to reconsider my engagement with Makro, especially the way that staff of colour treat the clientele.