MTN Service is pathetic

I upgraded in August 2020 and on the 19th January 2021 my phone started flickering and I took it for repairs. Fifteen days later I got a call to.say my phone is ready. When I collected the phone it wouldn't switch on and I took it back and they sent it back for repairs. Second week in March I received a call from Samsung Repair Centre informing me that my.phone has severe internal damage and I will have to pay R2 060 to have it repaired even though it was still in the warranty period. I have sent numerous emails to MTN and Samsung and I was told that the damage was due to negligence, even though my phone had a screen guard and a protective cover. So after almost three months of having my phone they refuse to fix it. MTN customer service is pathetic.