Complaint

I recently bought a Samsung phone imie:***. Model:A2 core, my phone shut down and I goodled to see what the issue was and I saw its a norm for A2 cores to go into a mode called sleep of death, sent my phone Into repairs through MRP TSAKANE to vodacom repairs then my phone was BER and according to the report from repairs.. I was told that my phone has 24 month warranty and I believe that this is a manufacture fault not customer fault as there is no physical damage on this phone... Please help me get my phone fixed or exchanged...