Repeatedly Sending Incorrect Item

I ordered a pair of Superga sneakers (Order 515961) on Superbalist's R300 off promo. When i received them they were the incorrect pair/colour. I could not request an exchange as the item was no longer in stock so was advised to request a refund which i did. The following day however I saw that the item was indeed in stock. Feeling angry about this i requested that the correct pair be sent to me. Superbalist refused to give me the original promo discount, first saying I should purchase the item at full price and then giving me a 30% discount which meant I'd still have to pay over R100 more than the original promo. After fighting with them for a few days they gave me the R300 off and I reordered the same shoes (Order 541148). I received them yesterday and have once again been sent the wrong pair! This is truly disappointing! The service has been below standard whilst selling premium products! You are not Superbalist, you are rather Substandard! I am at my wits end. How hard can it be to send the right pair of shoes!!!!