Have you contacted Google regarding the purchasing issue? If you have, and they asked to refer to Celcom, please provide us a copy of the communication with Google (email etc) for us to check further.
Please PM us at our FB messenger or, if you prefer contacting via email, please write to us at this page. We'll look into the matter and help you further.
Additionally, you might want to try the troubleshooting steps below in the issue with the direct billing in Google Play Store.
If you're unable to sign into your Google Account, I recommend posting your query in the Gmail Help Forum or log on to here as it would be the right forum to address your concern.
Hope this helps
Click on the Kudo button if this is helpful~
Click the "Accept as Solution" button if this has helped you solve your issue. You can help other member who are experiencing the same situation.