Sorry to hear you aren't seeing your credits reflected in your account. The best course of action; however, help you resolve your issue is to create an Azure Billing support request. This way, a support engineer can work directly with you with access to your subscription and provide the best possible solution.
You can create an Azure Billing support request by following these steps: ...
- Sign into the Azure portal.
- Search for "Help + support" in the search bar.
- Select "Help + support" from the search results.
- Select "New support request".
- Select "Billing" as the issue type.
- Fill out the required information and submit the request.