New update destroyed my phone

Hi there. So I have the iPhone 7 and it has been working perfectly fine for how long now. I got the new update but now my phone won’t make calls anymore, my audio for headphones no longer work, my WiFi and Bluetooth connections are terrible, my phone freezes up all the time, and if the phone turns off it will reboot over and over again for a good 20 minutes. I don’t think think this is fair that I have to buy a whole new phone because I was forced to do this update that ruined my perfectly good phone. I’m a college student so I obviously don’t have the money just laying around to get a new phone. I am very upset that I can’t even make a phone call to my parents.