Hisense AVOIDS to fulfil their Warranty on Violently Rattling Front Loader

I bought a Hisense 9kg front loader from Game Stores. After some months the machine started rattling violently and I remembered that I still have it under warranty. A technician came to assess my complaint but gave a bogus report saying nothing is wrong with my machine. I then went back to Game Stores to escalate the complaint to Hisense South Africa but they didn't resolve nothing. They sent me pillar to post with emails even though I have video evidence of the violently rattling front loader. I'm deeply hurt by this because all my electrical appliances are Hisense - my brand loyalty has come back to bite me. Hisense needs to fix their After Sales. I think a legal route is the only way to solve this.