Rude staff member

I went to Ackermans in West Street in Durban, just next to Shoprite, yesterday after work. I needed to buy a memory card for my phone. As I walked in I went to the til point and greeted the cashier and asked him if they have memory cards. His name on the name tag was Zipho. He asked another staff member to bring the memory card, which he did. He then started serving another customer and it looked like she was buying a phone, so it could take longer. There was another til point right next to him which had no customer in it. So I asked him if I needed to wait for him to finish or I could use the next till, which wasn't serving anyone. The answer that I got was shockingly rude. He said in isiZulu and I quote " what do you want me to do? Wait for me if you want or to or go there, it's your choice. I don't have eyes at the back of my head, so I can't see what's happening on the other till." I didn't and I still don't understand why he had to be so rude. If I wasn't that late, I would have left that memory card right there and bought it somewhere else. I wont be buying anything from Ackermans anytime soon, because of that attitude I got from Zipho. Ackermans customer services or management if your are reading this, please pass this message for me to Zipho: manner of approach is very important, especially when dealing with people.