Bad customer service and experience (online refund)

I have had a bad experience at the Mrp Home in Kokstad. I went to collect my online orders only to get there and some of my items were damaged. I asked if the store had replacements I was told none which I then opted for a refund since I paid cash for these orders. There came a store manager (I assume). The lady informed that I would be reimbursed via a gift voucher which I refused as I didn't pay via that payment method. I was then told that they don't have the R570. 00 to refund me in cash, that was after a long struggle between myself and this lady where she insisted on the voucher. I asked her to produce a return policy which says that which she couldn't. I was promised to be called yesterday as soon as the money was available and noone called me. Today I called to check on my refund, I was told the same story no money available. How so for such a bug national store as this one? I have supported this store for years and I must say that this is the first of getting such terrible service and bad customer experience. What must I do to get my refund? Make you guys trend on Twitter?! I would like this to be resolved before COB today!