Money not reveresed after failed card transaction

I purchased goods from Wingtip Pep on 16 March 2017. The cashier informed me that the card was declined and gave me the slip as proof. She then asked me to draw cash for the transaction. After drawing cash I then noticed that the amount had come off my account and has been pending ever since. With that amount being pending, it is unavailable for me to use so essentially I have paid twice for this purchase. I called the call centre and they told me it takes 7 to 10 working days for the pending amount to be reversed. This has still not happened. I emailed ********** without any response either and I am now furious! Please get this amount reversed ASAP without any excuses. This is blatant theft. If your card machines don't work, that is not my problem. My bank cannot reverse the amount, only you can so I suggest you do your job.