Very disrespectful young lady

Today I went to Checkers Pretoria to a buy a few things that I needed when I got I did my shopping and went to the tills,when I got I found a lady by the name of Nthabiseng,very kind lady,she scan all my things and then later asked me I wanted a plastic and I said yes,and then I realized that one plastic was not enough so I asked her for another plastic as gave me I then asked the lady that was packing my things her name is Lerato Mashiyane very rude and disrespectful young girl to please add the second plastic and the she said she won’t and she walked away,And then the duty manager that was at tills came and asked what did just happen I then explained everything to her and she packed my things,I then asked to see a manager and she came through her is Violet I told what happened and then she called Lerato and then same disrespectful started screaming telling her Manager that the was no need for to pack my plastic and she will never apologize for anything and she continue screaming embarrassing her manager and my self infront of everyone,I’ve never been disrespected like that in my life and I don’t why she’s working at the frontline because she’s a disrespectful peace of *******,she should be put at the back and receive that’s where she belong