Beware Edgars doesnt care about online purchases

Purchased 4 curtains from their online store they arrived middle march thursday , when hanging them on the weekend it was found that one of the curtains backing was different from the other three , reported this to help desk the monday, was told I would need to return it before they could organise a replacement , upon collection and return some two weeks later they could now no longer find a replacement and was told I need to accept a credit and a voucher of R100 for the inconvieniance , but I had purchased 4 curtains because I needed 4 curtains for the area , what was I suppose to do with the other 3 curtains that were hanging and waiting for the replacement to arrive - edgars refuses to uplift and credit the remaining 3 as they have been "used" , but they would not have been "used" if it wasn't that I was promised a replacement for the defective one. I would either like 4 curtains that match or a credit for all so I may purchase 4 that match - this complaint has been with edgars for 3 months now and they are in no hurry to resolve it