Terrible service from lazy cashiers

I went with my family to Edgars Eastgate this afternoon with the intention of making a purchase and giving the staff there a second chance. As on a number of occasions I have had appalling service with this store, which led to me paying up my account and using other retailers. Today's incident could have been easily avoided if the staff were polite or merely professional and helpful. I was next in the queue to be served and whilst there were 5 tellers, 1 was serving a customer and the other 4 were loitering and chatting. I waited 5 minutes and got anxious as were the shoppers behind me. 2 left there stuff behind and walked out. I chose to walk to the till and ask for assistance, the cashier told me she was busy with a customer and told me to go back to the queue in a very rude manner. I looked for a floor manager and eventually found one. I expressed my disappointment and walked out as I saw that no action was going to be taken with my bad experience.