Dissatisfied customer

In 2023 bought geniune leather sofa in UFO price was R50 000 called the store regarding the complaint that sofas were peeling off and changing the color to yellow, the manager attend to the issue nicely they said I should bring sofas at the store because the time I purchased sofas I didn't pay for delivery "ok that was fair for both company and the customer bear in mind that I hired a trailer from my home town to Richards bay almost every week I called the store regarding the issue from March 2025 but I was so disappointed when the repairing guy came to the store took pictures in May 2025 and they sent me an email that he assumed that there is something that feel on the sofa, so they wanted us to Pay R16000 for the material so my question is whose fault is it if the sofas were peeling and changing the color. Why are they convincing customers that it geniune leather where as it's plastic