Bad product from Hi-sense and service from Makro

I have purchased a 55” Hi-sense TV from Makro less than 6 moths ago. Within the first 3 weeks we have experienced issues with lines appearing on the scream, which they have repaired, because they did not want to exchange the unit. About a month later the TV started to switch off by it self and a blue screen appears...after we have done an update on the TV it didn’t happen again. Now, every day we experience a TV that switches off by it self with a ping sound and switches back on again. This is unacceptable for a TV that cost us R10 000 and Makro where we bought the TV also didn’t want to replace the unit.