Defy stove in festival mall.

My Name is NEO ***, on the 15/12/2021 I purchased a Defy stove from Game festival mall in Kempton Park, I paid cash R4699. 00 and I was sent to collect it from Germiston warehouse of which I did. On arrival home before installing it I realised it was faulty. I returned it to the shop, gave them the receipt and the gave me another one. 5 months latter in May 2021 the stove inside oven broke while I was grilling. I reported to the shop they told me they want a receipt so that they can book it for repairs. I told them I lost the slip, they asked me when did I buy and how much did I pay. I gave them dates and price. A month latter they call me, telling me they can't find my slip accordingly they will book it for Defy and unfortunately I have to pay Defy for the repairs... How is it unfortunate? What is unfortunate is for me to repair at my cost for something that is still under warranty. I contacted head office who told me they will avert to me. I am still waiting