Rude and bad attitude

Had a problem with my Nedbank card at the atm so I decide to withdraw at pick n pack, the lady ask me how much I need to withdraw and I wanted R2000 and she said it's still I don't have that kind of and what do you want to do, she was shouting and rude and she was like go to the other till but what I couldn't understand is why was she shouting and she need to respect me, I might be young but she have to respect. Thanks to the manager help to atleast withdraw R500