Duplicate transactions on my card not reversed

I went to watch Star Wars at the IMAX theatre in Cape Gate Mall on 26 December 2015. I tried to buy popcorn and drinks to the total of R179.30 at 19:47. I swiped my card and received an sms saying the transaction had been processed. According to the cashier however, it did not reflect on your system. I told her that the funds had come off of my account but she said that I should swipe again and the duplicate would be reversed if it did come off my account. I then swiped again and the same thing happened. I ended up just paying cash based on the fact that I was promised by two of your employees that my money would be returned to my account. It's now been nearly 2 months and the money has not been returned. Last week I asked my bank to reversed the charges and filled out the necesary forms but I've just been informed that Ster-Kinekor is disputing the charges. I was clearly triple charged and I have my bank statements and sms as proof. I gave the cash slip to the bank consultant when I submitted my claim and unfortunately no longer have it. Please can someone get back to me ASAP or even better just reverse the charges on my account immediately.