Charged for Product I did not Buy

I bough a special of toilet tissue - 3 pkts for R175. When I checked the slip at home I saw that I was charged for 4 pkts, so I paid an additional R64.00 for a product that I did not get. The cashier was obviously not paying attention and I have tried phoning Makro Alberton since Monday. Either no answer or I hold on for a ridiculous amount of time. There is no email address available anywhere as an alternative contact. The WhatsApp nr provided is useless too. I live far too far to drive back to the store to sort out R64.00. This is really unacceptable and leads me to wonder how many customers this happens to. Cashier service is bad and contacting them is basically out of the question, so must I just write off the money? No Makro, it does not work like this!!