Bad cashier

The lady who was on till number 16 in the morning around 8:56 she was so rude I ask her to give me cash back off R290 she gave me bad attitude she even told me that my card is not working but it ended up working because I don't know what she was doing maybe she's a learner or she still on training I don't understand but she was so rude because of the Mask I'm surprised because she managed to hear what I'm saying about the amount that I'm asking but she couldn't hear when I greet her I think she thought I didn't greet her or something like that but she has bad attitude