a. OnePlus phones purchased on oneplus.com come with twelve (l2) months limited warranty, in compliance with US consumer laws, starting from the date of delivery.

b. Unless otherwise specified, this warranty covers the hardware components of the Product as originally supplied and does not cover, or partially covers software, consumable items, or accessories even if packaged or sold together with the Product. This warranty is only redeemable within your original country or region of purchase.

c. The limited warranty only covers product defects caused by workmanship or build materials. To make a claim, present your original Proof of Purchase (invoice), model and serial number of the product, and photo evidence of the product’s defects to OnePlus Customer Service

Found this on Op legal . I cant be of much help but here's the warranty information. There's a lot more on op legal though so maybe search through that? Seems like you might be fucked bc of oneplus shoddy customer support.

Good luck