Angry customer

I purchased pair of Havaianas on 07.01.21 costing R450. At the point of order I was advised that item is returnable if faulty within 6 months. My costing flip flops broke and when I return them for exchange on the 09.04.21 lady told me that they are non returnable as it is customer negligence and I was given a customer care email to log my complaint. I did that and still no response up to date. How is this customer negligence when the shoe should be good quality as it is expensive? I mean I still have flip flops I purchased at Woolies 2 years ago costing R109 and worn Havaianas less than 6 months and they broke and can't be returned. I feel that Havaiana knows that they selling poor quality shoes hence lying to customers about their return process at the point of order. I have R450 flip flops I cannot even wear. The only way to complain is via email, no direct number or face to face customer service.