Horrific double billing on credit card

I visited the store in Gauteng - Riversands store and swiped my Makro card for half the bill of R1936. Since my partner and I split the bills.

We explicitly told this to the cashier and always do this at many stores, however, it turns out that paid R1936, and my partner paid a further R936.

I submitted the bills and bank statements with POP's of her swipe to the customer care email and it's been months- I still haven't received a response.

They gladly billed me interest over the months on the full amount - which is disgusting.

This needs to get rectified