iPhone 13 battery drain + overheating (even after shut down) - now won't turn on at all!

My iPhone 13 (after the 17.2.1 ios update) and after a 100% battery charge (battery health was over 94%, bought new in October 2022) started draining the battery as soon as I unplugged it. I was losing approx. 3-5% per minute, while doing nothing. In the meanwhile, it was extremely hot, to the point I couldn't hold it. I shut it down and it was still at the same temp for 1-2 hours meaning the batter was still depleting even when off. After it was aparrently depleted, and tried to charge it there was a message that I cannot be charged due to high temp. After that it does not even turn on! I have sent it for service, with the 2-year seller-provided warranty. Let's see how it goes.