Incorrectly charged for meat on special and now can't reach the store telephonically

I rushed to my local store on the last day of the weekly specials to buy especially the 4xpacks of the 16pieces braaipack ad guess what, I was charged different prices of R74, R80, R83 x2 for all the four packs I bought. Been calling the national contact number and 012 111 1999 so many times and automated response has been asking for my name and contact which I have done repeatedly hoping to resolve this miscalculation and so far, process has been stressful. I really need urgent intervention - I have the receipt and the meat