Refund back

I bought a microwave on the 31-December-2024 Bennett read brand. Then on the 5th may the microwave was no longer working I took it back .It went for repair then on the 22nd May 2025 I received it back and it was not working. On the 23rd May I took it back and asked for refund.,because the microwave it gave me a problem within 6months. And the brand it had a 2years warranty. Now they are telling me that the supplier is refusing to refund me back.they are saying the microwave it was more than 6months.