complaint

On 03/02/2015 I purchased a vodacom smart tab 3g, I swiped to pay then the first time it decline but second timevaround went through i later realised that it took double the amount of my purchases.I then went again to report this to the same cashier Zinhle on 04/02/2015 she promised that i shall be refunded within 48hour. Today it is the 09/02/2015 but still I have not been refunded.