TFG, Foschini really suck when it comes to online purchases

I purchased black Friday Specials in the Blacfk Friday week. Among other things, I bought sandals. They cost R89, their normal price is R150. When the order was delivered, in bits and pieces as Fischini does, everything else they had invoiced to deliver was delivered except the sandals; instead I received another person's dress. I called in to arrange delivery of my sandals and collection of the dress and I was advised by the agent that assisted me that they could do a collection of the dress and refund me for the sandals. I told her I wanted the sandals because the fact that they were dispatched meant the stock was there. She then said too bad its company policy, TFG will refund and I will have to make a seperate purchase. Here is my problem, that was a sale item, if I now have to purchase again after the refund, I will pay the full R150 and a delivery fee as well. I did not reject a product - I received a product that is not mine, I dont see why I cant get the correct product;. The lady who assisted me told me that the company's returns policy says I will get a refund. She even went as far as suggesting I contact the lady whose package I received so that we can do a peer swap, ridiculous. When I insisted on getting more help, she hung up on me. I didnt make the mistake, it was TFG that did, why should I be penalised for it? I want the sandals delivered to me as promised when I made the purchase and they can collect the dress they delivered to me! I sent an email to their online shop customer service email, I received a generic acknowledgement and nothing further. Such horrible service!