Unfair treatment from MTN and Mr Price cell

I bought my wife a cellphone A14 lite from Mr Price cell for R3000. On the 24 of February 2024. The cellphone started to have charging problems and could not charge at all and I returned it to Mr Price cell. On the 13th day of purchasing. The inspected the phone and did the report and booked phone for repairs with Mtn. Now Mr price called me yesterday day to tell that MTN said they can replace my cellphone because there is a dent on it they will book it for repairs. I am so upset and very angry because when I bought the phone same day i put the screen guard and shock resistance porch from Mr price cell. There was never a single tiny scratch on my phone why now they telling me there is a dent? More over the Mr price guy inspected the phone and said the phone was still new no stracthes or dents. So its probably the dent occured when they where transporting the phone or handling it that is if they are speaking tge truth. I am so angry my wife dosent have a phone as we speak and it took me time to gather that money to buy her a phone. I have pictures of the phone before sending it back. Why is it its always us consumers who have to suffer the consequences of the other companies or the error of manufacture on the products. I dont know what further steps I should take Because I am not going to accept this. This is really unfair. Even my wife was shocked when she had the news. Even my colleagues at work are Shocked Because they know the history of me having to buy that phone. And they saw it the day I send it back. And one of my colleagues was telling me that the Samsung A14 has charging problems because his phone dosent keep the battery power he have to always charge it. I am so regretting I am very dissapointed with MTN they want to take advantage of me