Disgruntled unhappy customer

I bought a pair of sneakers from sportscene last year and there was a defect in the shoe, I didn't have the receipt or the box but they replaced the sneaker. Now after a few months the replacement sneaker has the same defect and this time I have the original box but no receipt. I visited the store yesterday the manager Priscilla recognized me and she asked me if I had the receipt and I said no. She then said to come back the following day as she remembers me and will replace the sneaker the following day as they were busy with stock taking and as I never had the receipt. Now I actually dont recall receiving a receipt the second time around hence why I kept the box. I was advised as i dont have a receipt that they will not be able to help me meaning I should throw it away. I have the box with the barcode on and other details on it, which they refuse to assist me with. So am I now suppose to throw away a sneaker worth R1600 away because that is what they are saying. I work damn hard to just throw away the sneaker. Priscilla the manager at sportscene can lie and get away with it?

am very disappointed as I am again sitting with a defect sneaker which is expensive and I can get no further use of. I am going to give the area manger Ryan 48 hours to respond to my complaint, failing which I will be taking this issue further with the commissioner. I tried calling the area manger (Ryan) more than 10 times with no answer. Furthermore the lies and service I received from the store managers left alot to be desired. I sincerely wish this can be resolved before I am left with no choice to take this matter further.