i paid 2x and still waiting on my refund

yesterday I bought perfume at redsquare tygervalley. I paid with my card and got the sms from my bank that my goods were paid. According to the assistant the transaction did not go through and I had to pay again. She refused to give me the goods I paid for unless I pay AGAIN. She was unable to give me help and only after I asked her to call the manager she tried to do so, but realised the manager went out. I waited. The manager finally arrived and also could not resolve my query. She tried a lame excuse that there might be something wrong with helpdesk as there tel number was not working. Its actually a joke!!! This money is still not reversed and paid back to me as she tried to convince me that is how their system works!!! R1759 might not be much to them, but I SURE WANTS MY MONEY BACK!!!