I have been getting charge $10.81 a couple of times in a month i am not sure what that charge is about ?

This is primarily a user-to-user support forum; other Apple users like you. We don't have access to information about charges to your account. Apple has a support article about charges — see each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help. See: If you don't recognize a charge - Apple Support

or go to Subscriptions and Billing - Official Apple Support

Also, there is an Apple article that explains how to cancel subscriptions. Click on the following link: If you want to cancel a subscription from Apple - Apple Support

That billing is a known scam. Your credit card has been compromised.

https://toughnickel.com/scams-fraud/Apple-iTunes-866-712-7753-Scam