To Delete the Account on Azure, Follow the below steps :
Step-1: Login to the Microsoft Azure portal
Step-2: Click on the Cost Management + Billing link from the left navigation
Step-3: Click on the Subscriptions link from the left navigation
Step-4: Click on the Manage button on the Cost Management + Billing page.
Step-5: Click on the Subscription name.
Step-6: Click on the Cancel subscription link from the next screen to Cancel Azure Subscription.
Step-7: Select – Yes, cancel my subscription option