The quality of modern Samsung mobiles are pathetic

I have a Samsung J7 pro mobile for 10 months on contract. Recently it just stopped working whereby the screen went completely blank. The phone is still under warranty so i approached the samsung repair centre. At the repair centre , they stated the warranty only covers manufacturing defaults or software and they did not book my phone in because my phone had a minor scratch on it. The scratch is so small and vague that i did not even notice it until they showed me. They claim that the scratch is the reason that my phone is no longer working and i am liable for a big bill in order to repair it. I found that to be absolutely ridiculous because how can a phone that retails for R5000 completely stop working due to a slight scratch. I have owned samsung devices for the past 4 years and never had this issue but the quality of their devices today are pathetic and makes me feel **********. I would appreciate it if you guys can come up with a suitable solution to uphold the standards you claim to offer. I emailed samsung with reference number ********** 446 yet i am still left unhappy with your response.