BAD service

I bought a pair of shoes for my son on the 4th December 2015 from Uzzi, which the shoes was worn once and it gave my son blisters. I took it back on Saturday the 19th of December, at which the store manager asked me to bring the shoes with the box and the receipt. I went back on Sunday the 20th of December 2015 which I could not find the receipt, and I explained to the manager I had also given her the dates at which I bought the shoes. She was very unhelpful as a store manager, very rude, not polite at all. She did not even try to be of assistance to me. I even went as far as speaking to the branch manager at Truworths stores, at which he was very polite and even went to the store to speak to her to assist me, because what he said was \if the customer does not have the receipt it can be looked up in their files as long as the customer remembers the date and what transaction was made". She also still refused to assist me even after the manager from Truworths spoke to her. He clearly stated that she is unwilling to assist me. At this point I do not know what it is that I need to do with the shoes since its giving my child blisters"