@Vaishnavi In case if you have any other Azure subscription active you can follow the steps shared in below document section to create Azure Subscription and billing request: https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request#go-to-help--support-from-the-global-header
If you're unable to create support request, try to reach support via global customer support as shown below. https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Ensure to share your preferred contact method and account ID for the team to trace back and team will connect with you. Hope this helps!