If I could remove or reinstall the cardDAV function itself, that would be ideal.
This is not possible (built-in). But as long as you have backups of the CardDAV, you could try to wipe out the address books from the DB tables.
Did you try to remove and reinstall the contacts app?
This is not possible (built-in). But as long as you have backups of the CardDAV, you could try to wipe out the address books from the DB tables.