After a wreck, prioritize safety and call 911 to get an official police report....

https://dlf-ne.org/what-if-the-other-driver-changes-their-story-later-a-paralegals-guide-to-protecting-your-claim/

After a wreck, prioritize safety and call 911 to get an official police report. See a doctor immediately, even if you feel fine. Take plenty of photos, collect witness contact info, and watch what you say to insurance adjusters