Offline Line could not pay for my shoe

I visited Shoe city branch in Westgate mall today about 3.45 pm . I was not once asked if they could assist me. All the staff was busy unpacking and chatting away with each other. I helped myself getting my correct shoe size. When i went to pay nobody was at the paying point to take my payment.. I waited almost 5 minutes before a lady assisted me . I gave my card to pay for the shoes and it was declined. She then said they where offline and can she swipe again . But if it goes thru I should have it reversed. Which to me was weird, reason being the machine did not even gave a slip showing it was declined. She tried it for a second time and again it was declined and no slip or proof was given to me. I asked for the manager reason being I really wanted to buy the shoes. The manager did come and asked what's wrong she told her and said they are not aloud to swipe the card 3 times Which to me was strange reason being I bought shoes 15 min back at Bata shoes and the payment went thru with no problem . I left upset and said I would log this complaint on helo Peter not once was there a apology for the inconvenience ect not even by the managment.