Turn off Contacts of Accounts & Passwords


Contacts may be duplicated after get contacts from Google, so my suggestion that turn off contacts in settings.
Don't worry for that your can turn on those contacts after this app.

Settings->Accounts & Passwords Settings->Accounts & Passwords(Full Image)

Remove Gmail contacts. Remove Gmail contacts.(Full Image)

Remove iCloud contacts Remove iCloud contacts(Full Image)

Turn off Exchange contacts Turn off Exchange contacts(Full Image)