Poor service from Crocs

I purchased a pair of Crocs for my wife at the Cresta store about a year ago. The slops were hardly used but surprisingly broke. When I returned them I was told that the store will not replace it. I was then referred to Head Office in Cape Town. I contacted Allen Hendricks who is supposedly a client service person. He insisted that I provide proof of purchase, which I was unable to do. I asked that they do the right thing and give me a credit to the value of the purchase so that I could purchase a new pair. To date no response to my numerous requests.