SOLD SHOES WITH THE DIFFERENT SHOE SIZES AND NOT WILLING TO REFUND

On the 15th of May 2018 there was a massive sale at Side Step Jabulani Mall, Soweto. I bought three pairs of shoes. Unfortunately when I got home I realised that the shoes that I have purchased have different sizes. I went back to the store to query this but unfortunately I was treated like a fool by the staff members in that store. I went back several times but they are not prepared to refund me.