Incorrectly Debited - No refund - Bad Service

4 cans & 2 Tasty Chilli Relish from the shop costing R139.40. Whilst waiting,2 ladies bought smoked trout products,one for the amount of R536 & the other for R496, both of them paid by card.The blond lady paying R536 had no problem with the transaction,the brunette had problems & they tried it a few times. Then my mom paid her 2 jams. This lady still waiting for her transaction to go through. Then my turn,another lady took my card and swiped it,not the cashier that served me,it was so busy in the shop. We just took our receipt & left.When we arrived home, I took all my receipts from the weekend & noticed that they over charged me, I phoned them but no answer. I phoned the next morning early & eventually got hold of them. I informed them about the situation and it sounded like the person disbelieved me. So they said we will give me a call back. After waiting nearly the whole of Tuesday somebody else phoned &said they will check everything & will call us to get bank details etc. It is the end of Wednesday & we still have not received our money nor a proper explanation or excuse. Will warn friends & family to be careful. Very unprofessional way of handling this matter.