BAD CUSTOMER SERVICE & SELLING CHEAP STAFF

I have bought a pair of shoes at YDE with a debit card, for a big upcoming event. Few days later I saw the very same shoes on every corner of bree street selling for R200. My heart was aching because i wanted something unique for the function not something so common. I went back to exchange it & only to find out that I have lost the receipt & I went back to the store & presented my case & I took with me my bank records which was showing the store name, the amount & the date of purchase. They refused to exchange for me & now I am sitting with the R899.00 shoes that I am not satisfied with & I don't know what to do with it & the event is happening soon. The shoes were bought in less than two weeks & the store doesn't have the copy or payments remittances even after giving them the date, time, store name & amount of the purchase which is reflecting on my bank statement. Even at Chinese stores they would have treated me better than YDE. They run their stores like a ****a shops & it hurts & it's gonna cost them lots of customers. I want to exchange not a refund!