Disgruntled customer

I hv had bought 2 pairs on sale at R4300 on 6 August 25. Before i wore the heels i took them for sole attachments as a protective measure as the original sole is very thin. Nothing else done on the tip/heel itself. I wore the heel the 3rd time on monday and it broke in half. Then i went to the store in Menlyn where i bought them and the lady manager (white female) gave me an attitide from the onset. But i was eventually told to email customer care, and i dd only to request reoairs not refund or replacement. Today i recieve a response that nothing can be done coz the shoe is modified. Mind you the shoe is brocken on the heel and not the sole where a patch was placed. Im disgruntled. Coz what do u mean the store cant assist on a R3k shoe while i am a loyal customer and with such high quality expensive shoes. U lost me as a customer shame. Poor service and gross customer service from your store manager