@Eddy Au Yeung - Thanks for the question and using MS Q&A paltform.
As I understand you've an issue with your billing.
I recommend you to create a billing support ticket which is free of cost. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
Steps to create support case: How to create a support ticket for Azure billing and subscription issues
If you have questions or need help, create a support request and choose Issue type as “Billing” OR Call to “Global Customer Service phone numbers”.
Hope this helps. Do let us know if you have any further queries.