Extremely bad customer service

First week of December 2019, I bought shoes valued at R450 at Woolworth Mall@Reds. I don't frequently were the shoes but today I decided to wear the shoes and I realized they worn out on the sides. I called the branch and spoke to one of their manager Mable Sehume and she advised that I visit the branch and so they can observe the damage. When I got to the store, she was very intimidating and not friendly. I explained to her that I'm the one who gave her a call. She had a look of the shoe and said the shoes are now on special. She can exchange the shoes only and can't refund. I indicated to her that I don't want a refund, I just want the shoes because I love the shoes.. She is not customer centric, she was very impatient not willing to assist by limiting my options as a customer. She went to the shelf and said they don't have my size. When I asked her to check on the system to check or at least see which store has, she said she can't as the shoe is on special.. She indicated that there's nothing she can do.. Now I'm stranded with a damaged shoe and I'm told there's nothing they can do.. What do I with the shoes...?? Im 100% sure that there's a branch that has the size but I can't be driving around all your stores like a headless chicken looking for the shoes...!!