Complaint

I made a laybye at Exact Capegate 2021-12-12 I then paid it off on the 2021 - 12-23. When I got home one of the dresses was small, I couldn't take it back the same day as I was going for holidays. So today 2022-01-04 I decided to go to exchange it for a bigger size, brought the slip that proves that I bought it at the store for R159. To my surprise I was told that it's a wrong slip I should bring another one because now the dress is on markdown n they don't have the size I was looking for. I took an item n the cost was R109. We then had aan argument because they wante to pay R10 because the dress is no longer R159. I refused cz to me it doesn't make sense n to me it means that I'm loosing out R60+the R10 that I have to pay on top of the R159 that I had initially paid. The store manager was called'Nandi' and she also didn't assist me in my complaint. I even gave them an option I suggested that I take the item for R109 then they can keep the remaining balance.