Hello Rajeshramamurthy,
While all sales and purchases in the iTunes & App Store would be final, Apple understands that accidents can happen. We can’t set any expectations on whether a refund will be approved, but you can follow the guidance on this page here to request a refund for a recent charge from Apple: Request a refund for apps or content that you bought from Apple - Apple Support.
Also, take a moment to look over this link with information on how long refunds from the App Store or other Apple services can take: Check the status of a refund for apps or content that you bought from Apple - Apple Support. As it shows, the time it takes for the money to appear on your account or statement depends on the payment method.
If you still need further support with these charges, you'll want to reach out to Apple Support directly for further assistance. You can reach out to them by clicking here: Contact - Official Apple Support or over the phone by calling the number that is most local to your region: Contact Apple for support and service - Apple Support.
We hope we've provided you with the answers you need.
Kind regards!