Refusing to refund on a machine that worked 3 months, and this is within their policy.

I bought a Genesis Hydrovac Extreme on 29 June 2023 for R 5500.00, I was cleaning a carpet and the machine suddenly started making a funny noise when turning on giving off a wire-burning kind of smell, and stopped working, this was on 4 October 2023. I took it back to the shop on 8 October 2023. They said they would take it for repairs, but I don't want the machine anymore as it gave me problems very early. I want a refund but they are telling me they don't do refunds, yet their slip stipulates that they will repair, replace, or refund within 6 months upon material defect as per prescribed use. They say it needs to be returned to the supplier and I am not sure what will happen from there.