Worst online shopping experience

On 2 November I ordered a serotonin necklace from We Heart This and paid R125 in courier fees for 3 to 5 day delivery. Two weeks later I had received no parcel and no update. I contacted We Heart This and was advised that they were out of stock as the one I ordered was broken and they are waiting for another batch to come from overseas which was due the next week. I was offered a refund on the courier fee. It is now 5 December and I haven't been refunded for my courier fees nor have I received the necklace. Yesterday I emailed asking for a full refund and to just forget about the necklace. No reply has been sent to me. I am beyond furious. They've taken my money, aren't sending the product and are not refunding me. It is appalling. I never get any progress update from them unless I email them to ask what is happening. And now I'm not getting any reply at all.