Defy microwave at Game jhb cbd

I bought a microwave on the 15 March 2020 with two years warranty. Now it's not warming food and my warranty ends on the 15 March 2022. I went to Game with Bank statement since we'll my receipt is lost. Now I received a call that I must pay 400 for slip. And my warranty was 1 year . The lady by the repair is do rude