Bad service

I bought a second hand grinder at Cash Crusaders Princess Crossing Roodepoort on the 29th of October 2021 and I used it on 3rd of November, after few minutes it tripped the electricity and had fire sparks, I took it back and the consultant referred me to a manager who told me that it only has 2days warranty and I asked him why such is not written on their warranty invoice, he said said the other thing is that its a second hand, As a consumer I know I have rights and this won't end here, I expected the manager to book it for repairs or refund me, I have been a customer to the same shop for some time and I won't allow to be treated as if cash crusaders are making me a favor. I want this to be sorted ASAP,