I originally had call tracking enabled for my agency, even though that option is no longer available in GBP reporting, the tracking number that was enabled by Google to originally make it work is still active. The number is still forwarded correctly, but I would assume that eventually those tracking numbers will be decommissioned.
You can double-check it by going to a GBP on a mobile device, tapping on the Call button and seeing what phone number comes up in the dialer.
Mine was incorrect.
I went into Business Profile Settings >> Advanced Settings & activated the “Don’t show” slider in the Phone number section (there is no save option I just closed the Advanced settings dialog box and it was applied):
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It took about 2 hours before I saw it removed from the profile (YMMV).
After it was removed, I simply went back to that same setting and set it back to the deactivate position:
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I then went back into the phone number section, which was now showing as blank and added the phone number back in.
After about 15 minutes, the phone number was showing on the profile again, but when I went into an incognito window and selected the call button, that original tracking number was back.