Hi @Dharmendra Ahirwar ,
to answer the question why you are charged for Azure services the best option might be to open a support case with Microsoft Azure support for clarification.
Azure Billing and Subscription support is offered by Microsoft by no cost and it's for free.
Source: Azure Support plans
Without seeing/having the exact facts of your Azure billing/costs it's almost impossible to help with this question in Q&A.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)