Bad service after duplicate transaction

I purchased food for R116,50 three weeks ago, the cashier swiped my card twice and she said the duplicate amount will be reversed in 2 day, then it was not. I went to the shop again after 5 days with bank statement, the manager then said she will call me back the next day, she did not. I called couple of times and I told the amount will be reversed and later no one took responsibility. The manager then said\ We know about the 2 transactions but we cant help you to get refund". I the called the KFC customer complaint centre"