Hi @ttu Thank you for reaching out to us. Happy to assist!
From the details provided, I learnt that your old credit card expired and you received a new one that you added to your Azure account. However, the payments are declined.
First thing, can you confirm that the new credit card is reflecting in the portal and made it the default payment card?
Reference: https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/change-credit-card
If yes, and still facing issues with payments, highly recommend contacting Azure billing and subscription management team by raising a support request to look into this issue. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
FYI: Azure Billing and Subscription Management support is included in the Basic Support Plan without any charge.
https://azure.microsoft.com/en-us/support/plans/
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