Can't update or download apps without wifi I have a one plus 3T Oxygen 4.1.7.

I can no longer download/update apps on the Playstore without wifi, I used to be able to until I accidentally checked to always download over wifi only.

Here are the things I tried to fix it.

I've already changed : Play Store > Settings > Auto-update apps to Auto-update apps at any time. Data charges may apply. 

I've also changed Settings > Google > Data Management > Update Drive-enabled app files - Over wifi or cellular. 

I've uninstalled play store then reinstall as well as . I've restarted multiple times after each of the above steps.
So far nothing works.

Thanks
Clear Data this apps:

Google Play Store
Google Play Services
Settings

one of this apps may contain the data that prevents your device to have additional charges. But I'm not really sure if this will work..
The Very Best solution I know is to reformat your device to clear all the settings you entered therein.