Terrible service from a cashier

I went to purchase 2 globes at the Metro Home Centre Menlyn. As I walked towards as till and placed my goods on the counter the cashier simply ignored me. I asked, can I pay here and she simply responded with a loud \NO."She then spoke to the cashier next to her in her own black language and simply ignored me. I then thought she was going to help me but continued to look at her computer. I then again asked"