Radio/tape Cd Player problems of the 2011 BMW X5

The following took place in June 2020. I still own the vehicle. I've garage kept my SUV, however recently I moved to city for work and been parking my X5 outside. It had been raining pretty hard in the last few days and I was driving w/ my 4-year-old in back when suddenly the dashboard warning lights and various messages on the entertainment screen started flashing. The warnings took me off guard and some of the messages that my engine may stall in the middle of traffic made me panic, especially with my kid in the back. I pulled over and started taking pictures messages. I researched and found the water from the sunroof leaks into the left side of the trunk where the electronics and audio equipment are located. (now I know it leaked on both side�as leith BMW technician found water on the right side too with electric wires submerged). I found about half a gallon of water accumulated. I took water out using a water bottle I cut in the middle and tried to dry off affected electronics. When I restarted the vehicle, the chimes are gone and so is the sound. The radio stations and navigation works, but there is absolutely no sound coming out. Also, the trunk lift gate does not automatically open anymore making it very hard to operate and the engine light won't go away. I contacted BMW and explained the situation and they told me to take my vehicle to BMW authorized dealer and pay out of pocket for it. That cost around $400. I kept receipt. All their communication was verbal as to not leave email trail. The only solid rejection letter I received is when they replied to my bbb complaint. So far I have contacted BMW directly who rejected my claims, bbb of new jersey (where BMW is located) who contacted BMW directly and BMW sent a rejection letter, consumer reports, cpsp. Gov who directed me to national highway traffic safety administration. Thank you for your help.