Money debited twice from my account at point of sale.

04 May 2016 @ 15:44pm. I was purchasing groceries at Shoprite Steenberg. Upon paying for the items with my Standard Bank card my card declined according to the pad it showed approved but cashier told me her till showed it declined I asked the cashier to try again as I know that there is definitely funds on the card it declined again. I then had to borrow money from a neighbor who also happened to be in the store at that particular time. Upon checking my cellphone I saw that the amount of R173.77 WENT OFF TWICE FROM MY ACCOUNT. I returned to the store for a refund and was told by the Admin Manager that I am the 5th customer with this problem today and that I needed to wait 2 - 3 working days for the funds to be reversed back into my account. The manner in which the Admin Manger of the store handled my query was unacceptable as I has to face the embarrassment of my card declining and also of my items being taken away to the office until I come back with the cash, I called the head office today and was told there is nothing they can do as this was an Standard Bank error and I needed to wait until Standard Bank has resolved this. I then spoke to a manager at the head office named Shaley advising me that this is not an Shoprite error but the Banking Merchant. I am so frustrated and angry with the way in which Shoprite has handled me as a client who shops at this store on a regular basis. I will no longer be supporting this Shoprite.