Worse Experience Ever

I just had it now with mtn. I reniew my contract by them for a samsung 10 plus. I did nt even have the phone for a month and it got a small chip on the screen next to the power button. The screen when white. When i baught the phone mtn told me that i fo get one free screen replacement by samsung. I took my phone to samsung repairs by canal walk cape town were they told me they dont fixed the phone only untill samsung 7. And send me away to a place in canal walk that do replace the screen but charge R8000. I think its real bad for mtn to sell contract to customers and dont be honest. Mtn did sent me a reply. Please see attach. This phone is not a cheap phone. And i only believe in samsung. But its worse than worse of the service i get as a customer. Who must fixed my phone on the end of the day. I getting send away from samsung and mtn. This phone is baught new not second hand and its the worse experience i every receive from samsung and mtn i am a loyal client to both of this company's. I only believe in samsung and did believe that samsung and mtn always keep their clients happy and tread them professional but after this experience i am defnity not so sure anymore