Can someone explain warranty claim denied on technicality?

Sorry for the wall of text. I've been trying to resolve this on my own but I'm stuck.

warranty claim denied on technicality. I've been dealing with this for about 13 months now and the situation isn't improving.

Has anyone been through something similar? What worked for you?

Classic scenario honestly.

In my case, it took about 3-6 months to resolve. The key was having everything documented.