Bad attitude from cashier

I visited Game Pinetown today 5 March 2018, and the cashiers name was Happy Zama Njecana. She was extremely rude and stubborn during the transaction. That's the only and best way l can describe it. I don't know how else to explain bad attitude. She seemed angry at life, or disappointed in her job, or something to that effect. I displayed the very same stubbornness towards her, which is completely against my nature, but it comes out when people treat me like that. This is the 2nd time I've experienced this pathetic kind of service from this particular store.