Thin Black line in my Ipad 9th gen 10.2 inch

I purchased a 9th generation Ipad from "applegadgetsbd"( https://www.applegadgetsbd.com/) on August 8, 2023. I've had a "Thin black line" issue (mostly dead pixel ) on my iPad's bottom border which might be present from the beginning of purchased but I didn't notice it since it's very thin and almost near the edge of my iPad and I noticed it after using few days (4 to 5 days ). Currently, "applegadgetsbd" has informed me that they are unable to provide a warranty for display (hardware)-related issues, but according to the official website of Apple, "Every iPad comes with one year of hardware repair coverage through its limited warranty and up to 90 days of complimentary technical support."(https://www.apple.com/support/products/ipad/). Furthermore, Apple has confirmed that any black line problem in the display is a "hardware" problem (https://discussions.apple.com/thread/252297517). However, "applegadgetsbd" didn't offer me any warranty regarding this issue. Which is totally unaccepted and unethical from Apple Reseller like "applegadgetsbd".