If it’s still under warranty, they HAVE to unless they can prove your modification caused the system to fail. It’s no different than the silly stickers that say “warranty void if removed” - that’s a nice fantasy for the manufacturer, but at least in the US it’s been ruled those stickers mean absolutely nothing. If they’re refusing to fix a phone under warranty, contact your local AG and enjoy watching them squirm. Loop in the FTC for good measure.

https://www.ftc.gov/business-guidance/resources/businesspersons-guide-federal-warranty-law#Magnuson-Moss

All part of the attempt to sway the next election. Gives Cucker Tarlson an interview where he (Putin) proceeds to paint all of his actions as a poor humble Russian leader just trying to protect his own people from the big bad Ukranians. Then follows it up with an offer to negotiate peace, which shockingly the evil dictator Biden refuses to do. If only we had someone like the Cheeto Benito who’s interested in peace leading the US, everything would be so much better for everyone! Queue troll farm spamming Twitter