refund // false advertising

Went to woollies to buy a few grocery and I saw a special for lasagne which was written R75 you save R25. I get to the till and my total payment was R383 but something said I must check my slip. I checked my slip the lasagne cost R179 so I asked the lady why R179 because it's on special. Went to customer service and they said it was packed on the wrong place because it's the 1kg that is R75 and 2kg is R179. That is very misleading and false advertising. I said I just want my money back in my card. They wanted to give me cash and I said no because the transaction was done via my debit card. They called the store manager who was very rude; he tells me that it will be my problem that I want my card back in my debit card. I was at woollies for 40mins wasted my lunch time. The money cannot take 3 to 4 working days to be returned because my payment to woollies didn't take 3 to 4 working days to buy the food. I was humiliated by him he was extremely rude coming from the store manager. A lady called Bhono calls me informing that she can go and deposit the money in my account after a left woollies I'm very upset and disappointed how can this be my problem. i want my money back