Stuttafords Gateway refuse to refund purchase.

My Wife bought 3 POLO short sleeve shirts from Stuttafords Gateway on a buy 2 get one free deal. when i tried the one shirt on it was too small so i tried to swap it for a bigger size but they never had the stock. and i did not like any of the other colours as their stock is so limited. I tried on a pair of long jeans instead but it did not fit well and could really not find anything else i liked. On approaching customer services they offered to give me a voucher card instead of cash refund but instead of at the shirt price of R799. which would enable me to purchase another item at the same value they only offered me the discounted value of R599. this would mean that i would need to pay another R200. to purchase the same goods which was not the same deal. I then asked them to credit me in cash on the whole purchase and they refused saying they could now only give me a gift card to the same original value of the purchase. I consider this unreasonable and very short sighted as i have always shopped at Stuttafords Gateway but i wont go back unless they refund me in cash. It is not my fault that they did not have the stock and very limited choice.I wish to warn everyone of this ****