Makro failed to fix my Skyworth TV under extended warranty

I bought a Skyworth TV from Makro and took out an extended warranty for peace of mind. However, when I had a problem with the TV and sent it to Makro for repair, I was very disappointed with their service. They did not send the TV to the official Skyworth service center, but to an unknown technician who did a poor job. When I got the TV back, it was worse than before. It was lagging, and I could not install DSTV on it anymore. I contacted Makro again and logged a second call (***) on 14 July 2023, but they have not resolved the issue. They keep telling me that a technician will phone me, but it never happens. I have also sent follow-up emails, but they are not helpful at all. I feel like Makro does not care about their customers or honor their warranty. I am very unhappy with Makro and their service. I want them to fix my TV properly or replace it with a new one.