Software Update Issues

The day after the previous software update on my iPhone 12 anytime a call would come in, I could not hear the person calling unless I turned the speakerphone on. The phone did not get wet or dropped or anything, the only change was the software update. Please help. After searching this topic I’ve found it’s very common, and scary considering apple has already been sued for doing this kind of thing to get people to buy new phones. Anyway, some settings were changed and I was able to get the speaker to work sort of. It’s extremely quiet and I can barely hear through it but the volume is all the way up. Furthermore, when connected through Bluetooth in my car, there’s glitches when calls come in, lots of them. It shouldn’t be an issue.