Disappointment, Disgusted by Service Received

Good Day, I purchased a pair of Sneakers from a Store at Rosebank SA Called Cross Trainer. The pair was Bought Late December and Late in May after my Holiday I gave my Sneakers a first Wash and the Vinyl on both sneakers peeled off and now their head office claims that it is not a Factory Fault, I have several designers shoes I have purchased from other Stores and this has never happened before. Some of which I washed together with this Pair.

Kindly advise as to what my way forward should be as they refuse to refund me or give me a replacement pair and I have spent R900.00 on this purchase and have hardly had the opportunity to enjoy my purchase, rather a lot of disappointment.