Bad service at Street Food on Fox Street

There is a lady at Street Food (associated with Pata Pata), she is extremely rude. I actually feel like that's an understatement. This lady cares nothing about customers or customer service. I went there to buy a roll, I had R100 with me (keep in mind, this is during lunch peak hours). She looked at me, looked at her co-worker and shrugged her shoulders as if I shouldn't even be there trying to buy food with big money. Firstly, why don't they have change around lunch hour? Secondly, why didn't this lady just explain nicely to me that they don't have change they'll try to get it for me, or I must come back later? Why did she have to shrug her shoulders and look at me like I'm not even worthy?