Bad service and attitude

I bought a top on 8 Feb 2016. I fitted size small and trousers size xs. Both were perfect. However, the top was damaged and I had to take a different one from the shelf. The lady did say that I can' t return the item from which I understood no refund. When I got home I immefiately saw that I took a xs top and not a small. I went back yesterday and explain to the store manager what happened and just told me I can lay a complaint if I'm not happy. I asked her to phone the number she gave me, which se did reluctantly. I again explained my problem and was told that it will be referred to the area manager. In the mean time I've contacted Yde in their fb page, but the response is still the same. I've contacted Truworths on their fb page, because Yde is owned by Truworths, still waiting for someone to contact me. I can't afford to pay R420 for a top just to throw in my cupboard. It states on the back of the slip that the item cant be returned when its an end-of-the-season sale, nothing about normal sales. Nowhere it is indicated or I was told that it was an end of season sale. I demand them to exchange this top, it was a very honest mistake. I want an area manager to contact me.