Double charged me via unreliable card system

Very unhappy with the service received, on the 15th of september I was made a purchase for 2 jeans, the in store card system is totally unreliable as it connects with a bluetooth to the salemans phone and then uses data to get the payment done, I had swiped 3 times with it failing each time. The last time I received an sms saying that the money for the purchased had been reserved from my account. The salesman then told me that it did not reflect on his side and the money will return in my account in 24 hours. I then left the store and drove to the nearest FNB atm to withdraw cash to make this purchase, I returned to the store and purchased the 2 pairs of jeans. The salesman assured me again the money would return in 24 hours. The money went out of my account on the 19th of september. Nothing had returned as relflected in a bank statement which I had to get as proof because of the unreliable payment methods this store offers. Now when I need the cash which was taken from me and which was no way my fault for this happening, I am being told that I should bring the proof and the owner would have to look at it only on Monday the 25th!!! I am very unhappy as I've been a life customer for very well more than 6 years now, my siblings for much more longer than that! I want my money back today! Being double charged was no way my fault! Very disappointed with this service. Bare in mind this is at the stamford hill branch! I provided the statement and proof on saturday the 23rd. It is now tuesday the 26th of september the salemans who works has been telling me the entire day that he is waiting for the owner to sort the problem out. The entire day has passed and I received no feedback what so ever. They continue to ignore my messages and calls. This is very unfair and a very pathetic system they are using. Extremely outraged and disappointed.