People in my contacts list are saying I called them when I didn’t. I checked my call and message history on the website, but those phantom calls are not there.
It sounds like someone is spoofing your number. Since the people being called are in your contact list it is possible your Gmail account has been compromised since your number and their numbers are likely stored there. I’d start by changing my Gmail password.
It is also possible to see if someone is accessing your Gmail account from someplace you have never been. You can learn about this and other Google safety features here: