Dissatisfied Jet customer

Jet stores in Somerset West Town As a regular customer at Jet stores I am extremely dissatisfied with their customer service today- 3 April 2025. My son has received a gift from his grandmother but it did not fit him, the items was school uniform which was still in its original Jet packaging and all barcodes and price tags was still in place. I went to the store this morning, asked the lady by the door what should I do with the items I got because I want to exchange it for something else, the lady just said I should keep the items with me and go fetch what I wanted and go to till. This lady end up being the store manager which was shocking since she did not even feel the need to greet me at the door or welcomed me in at any manner, she was just grumpy and short off. At other stores the front door person are the face of the store, they make you feel welcome by greeting with a smile but not at Jet Somerset. I got the items I wanted and went to the till, the cashier also no greeting, just "where's your slip" cold and short off. I responded, I don't have a slip it was a gift, the cashier then said with so much irritation - "I cannot help you then". I was confused because I did not wanted my money back and the items was bought at Jet but they refusing to help me just to exchange for something else. I asked then what must I do now with the items . The cashier said "I don't know". Finish and that's that. I found this extremely unprofessional and rude, no customer service whatsoever. I had to turn around and ride back home without being helped. I phoned customer service and they responded very quickly, somehow they end up contacting the wrong store so the manager Esmeralda called me to my cell and apologized for the service and asked me to come back to store but she is the manager of Somerset mall. She thought I was helped in her store which I wasn't. The manner Esmeralda spoke to me was so pleasing, the respect and professionalism was so outstanding, I actually wished I had gone to Somerset mall. She then told me to then go back to Somerset town and ask for the manager, which I did but the manager was so short off, basically taking the cashier's side by telling me that they do not authorize exchanges without till slips and she will need to take this further and she was just so unprofessional, the way she speak, no remorse for the rudeness of her staff member nothing. We ended up shouting at each other which I found ridiculous. Where is the customer service, I am still the customer and I am unhappy but she don't seem to care about that it just seem like I was inconvenient her and I am the problem. The attitude of the store manager and assistant was horrible. The store manager is no example for her staff clearly. I will definitely not put my feet in that store again.