Paid three times for one transaction but no refund

On 27/05/2015 I bought some items at Woolworths Middelburg (CBD) store for R576.40. The teller took my Nedbank cheque card and swiped it and told me that it did not go through. She swiped it again and said again that it did not go through. I took the card and gave her cash for the whole amount. When I left I saw on my phone that the amount went off my bank two times. I phoned Nedbank and they told me that I should wait until the amounts show on my bank statement then I should go to the woolworths branch and ask for my money back. On 2 June 2015 I went to the store the manageress Florence, refused to refund me. She called Nedbank in from of me upon which they said she must refund me and she also said to them that she will not as she will be short then. After blatantly refusing to refund me I left the store and went to my bank. They again told me that Florence should have refunded me as the money went off my account. They said that they could lodge a dispute on my behalf. My opinion is that you should not put people in managers positions if they cannot deal with customers correctly and professionally. I am sure that Florence is not fit to be in that position. Still no refund!!!