How to fix this issue
If you’re looking for a quick-and-dirty solution to this phantom calling bug, here it is: reboot your phone. According to 9to5Google, a restart appears to be a good, temporary way to stop Google Assistant on your Pixel 6 or 6 Pro from calling your contacts list at random. There’s no telling when the Assistant will start back up again, but at least you know you’re safe for some time after the phone turns back on.
You aren’t just limited to a temporary fix, however; for a more permanent solution, consider disabling Google Assistant when your Pixel is locked. It’s a trade-off, since you’ll lose some Google Assistant functionality while your phone is inactive, but doing so will save your friends and acquaintances from receiving continued calls without your knowledge.
To disable Google Assistant while your phone is locked, open the Google app, choose your profile, then tap “Settings.” Now, choose “Google Assistant,” then “Lock screen,” then disable “Assistant responses on lock screen.”
Luckily, you won’t be stuck with this option forever: Google is reportedly aware of the issue and actively working on a fix. Once the company patches the issue, it should arrive on your device via a software update. We’ll keep an eye on the situation, and update this article with any new information. However, until then, keep an eye on your settings app for any new software updates that might be issued.