Charged double for 1 transaction

On Friday the 25th of November I made a card purchase from The uniform Depot Shop for R1979.25. The first attempt timed out and the transaction was unsuccessful. The lady assisting me used a different card machine which was successful. On Saturday the 3rd of December I received a Capitec bank notification at 7am of the same transaction. I checked my accounts and realised that the money had actually gone out of my account for the second time. The bank card was in my possession the whole week and as well as the time the transaction went through, the shop does not open on Saturdays. On Monday the 5th I went to the shop to enquire and they said they would check. At 9:30 that same day I received a call from Elois from the uniform shop to tell me that they checked their books and there was only one transaction of that amount. Later in the afternoon I visited the Mall at Reds Capitec branch and explained what had happened, the consultant that helped me checked my account and said the money has definitely went through and the shop must refund me. She suggested I take my statement as proof that money left my account with the same reference. The following morning I took my statement back to the shop and showed them and even allowed them to make a copy. I then contacted Capitec via Twitter for assistance while I wait for the shop to do a thorough check and they referred me to the contact centre. Later that morning I called the contact centre and the consultant confirmed that money was paid from my account and the reference was the same as the transaction that was made on the 25th. On Wednesday afternoon the 7th I received an email from Elois from the uniform shop to say again that there was only one transaction on their side and I must check with my bank again. I have contacted Capitec but have not received a response from them since last week Wednesday.