Sold incorrect underwear size

On the 23rd of August (18:45) I arrived at the shop. looked around, then went to the underwear section. The lady working in the underwear department asked one of the other employees to look at her section whilst she went elsewhere. later she came to me while I was looking at some underwear, checking for my size. she asked if she could help cause they were about to close and their system is also about to shut down. I think she was in a hurry to leave because of the way she spoke. I told her I'm looking for size "10". She just took one of the underwear and gave it to me. I went to pay and she followed me. She then insisted that I pay on the men's section. She charged everything then gave me slip and I left. When I got home I tried to put on the underwear and it didn't fit. When I checked the label it was actually a size 6!

Now I was checking for the correct size until she came, insisted on helping me, only to be assisted with the wrong size. now we all know you don't return underwear for health reasons. now what do I do when the staff sold me something that is 3 times smaller? I am very upset about this, I don't waste my money for nothing. I called the customer care line the following day and the lady I spoke too was also just as ***********. I told her what happened and the only thing she could say was the employee gave me the right size! they use UK size not US size. I told her we are not in america and I will never look for a size 3x smaller. She insisted that her employee was correct. I asked for a size 10 but was given a size 6. we are in south africa and their employee should have been trained to know the difference.

Its either they take the underwear back and give me my proper south african size or they give me a full refund.

Employee no: 160164 Cashed up at 19:03

My cell no ********** 144