Imcompetent staff

On Friday 8 January 2016 visited this Cell C branch to purchase Prepaid internet data for one year which equals to 2gig per month for 12 months. On swiping my Cash card was told there was a problem and the machine had to be reset and that I must wait. Was asked after some time if I could rather pay with cash. Had to walk to the Bank to draw the cash and it cost me money to do the withdrawal. The problem is that they had this same problem with the machine a year ago when I did the same purchase. Is it possible that after a year they still had the same problem with their card swipe machine. Their attitude was disgusting and client service sucks.