Customer return

Good morning my name is Thabo kampi I bought a Samsung A14 green DS NL on the 25th of July 2023 at Mr Price protea glen mall. The phone didn't even last me 2 months it died on me and didn't want 2 switch on anymore. I returned the phone back to the Mr price shop and the consultant of the shop who is Errol Sambo said he'll send the phone to MTN under defective goods claim.One week past I went back to the store for feedback when I got there the consultant told me that MTN won't fix the phone cause inside it has scratches on the lens. I told the consultant that how is it possible that the phone has scratches on the lens inside if outside the screen has no visible signs of damage and they said there's nothing they can do. I have 1 and a half month sitting with a dead phone which I still have not finished paying cause I bought the phone under my mothers Mr price account I paid R2500 via my mother's Mr price account the remaining balance is R1200 cause the price of the phone is R3700. The phone is still under warranty but they refuse to fix it I asked them how is it possible that I caused the scratches on the lens inside the phone when the outside screen has no sign of damage and they failed to answer me and told me to contact MTN for queries