Failure to refund faulty Aim microwave within guarantee period

I bought an Aim microwave at Canal Walk PnP in January 2023. Last month, August 2024 it started to spark dangerously and tripped my power at home. While looking for the till slip, I was forced to buy a new microwave and eventually took it back to PnP Hyper on Sat, 14 September 2024. They informed me that I wont be refunded seeing that it was bought at Canal Walk, and not by them. I then took it to Canal Walk PnP and someone wanted to refund my money back when another person said no it cant be refunded seeing that the time period was almost 2 years. The product guarantee is for 2 years, expiring on January 2025, but they did not want to give in even after I was explaining that a new microwave was already bought. Now it was send for repairs which will hopefully take 21 days . Is it so difficult to refund a product although it is still within the guarantee period, never mind if it is in the 23rd month of a 24 month guarantee period?