Where is my refund!!

On the 25th November I purchased almost R1.5k worth of garden items from their Parklands cape town branch via the online store and only 6 plants were delivered, the value about R400. After waiting for the delivery of my remaining items, many phone calls and broken promises later, I instructed them 4 times to refund my money and they are blatantly ignoring me and not paying my money back. Absolutely disgusting and I will advise others not to buy online from them. I demand my money back