Mac screen issue, repairing

Hello, I purchased Mac Pro m1 a month ago and it suddenly started screen problems like flickering, turning into black and and so on, sometimes it was taking days to show the display, so i took it to Issuport in Georgia and they told me that screen changing was needed, I don’t understand why the newest mac Pro may need changing the screen, shouldn’t they change the device into new one? They told me that, they don’t change Macs into new one, just they repair it for free in case of having warranty. But I feel so disappointed, cause I spent thousands of dollars to it just not to experience these kind of issues and I was sure that apple would be the best choice in this case for long term working and studying, I was taking care of it like baby, no physical damage, nothing just. I would like to know if someone experienced this kind of frustration, please inform me how did you act and is this reality that apple authorized resellers really don’t change this kind of devices into new one? And how can I be sure that they will change the screen into original one? I’m so worried, please help, I need clarification from trusted one 🙏🏻