engen garage swiping card twice and not refunding

On friday morning 27/02/2015 I stopped at engen garage in rowhill springs where I fill up every week after filling up I handed my garage card to the attendant he took it to be swiped and then returned to say they have a network issue and he tried again swiping and swiping and then said I have insufficient funds I then checked my banking and saw that the amount has gone off twice then I spoke to a manager where I got no assistance the next day I went back there again spoke to a lady wich said I should return on the sunday, when I got there on sunday that woman wasnt even in to assist me so I spoke to the manager again and he put me through to the owners wife which also was no help at all and said I can go complain to the newspaper and where ever I felt like it and hung up the phone on me twice and now the money still hasnt been reversed back to my account like promised on friday