Defective Microwave and Bad service

I bought a microwave oven at Hirsch Milnerton on 26 February 2021, a Samsung brand ME0113M1 the microwave has stopped heating food as from 24 May 2021 which is within 3 months and the store is refusing to refund me or give me a new microwave they rather repair it whilst i am sitting at home for a week with no microwave . This is totally unacceptable and a bad service altogether especially for a product that is not even a year old. Samsung is manufacturing defective products now that require repairs within 3 months and you think this is a good service. Your store protocol is ridiculous when it comes to customer dissatisfaction is it because you are well aware that you are selling defective products.