Rude Shouting Manager with no professionalism and ethics

I went to exchange my son's school trouser at the PEP Newtown junction today due to the size being small, when I told the lady that I lost my slip and do not want to money or anything but a different size she rudely rep**** to me with hand gestures , even pulling her mask down saying " Did you not read your slip? we do not exchange without a slip" that rule applies to everyone including you because you are not speacial. I then oh i am leaving this item and walked out, after walking out I remebered my consumer rights and walked back in and said to her i am sure you can go to yesterdays records and retrieve the slip, she shouted Oh now you are back ? Now you want assistance ? From me ? laughing and looking at the other customers and saying to them look at what we deal with, they think they are better than us. I said to her do not talk to me like that I am a client and that is not how you treat clients , she said to me how do you want me to treat you ? In my entire life I have never ever ever ever experienced such a hostile person who is supposed to be a professional ever! she then got me my slip , this time with respect and we said our goodbyes. However I will not let this go, no clustomer desrves to be treated like this or spoken to like the way she did . I want a personal apology from that woman! and HR needs to step in and speak to her about her holiganism towards customers. The authosrised slip says approved by MJ and has her signature