I am curious is an itunes plan costs $9.99 why am I getting charged $15.49 every month?

Use the instructions in the following to view your subscriptions (you may be subscribed to something else as well as Apple Music). See instructions in If you want to cancel a subscription from Apple - Apple Support

If that doesn't help, be aware that 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. See each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help: If you see 'apple.com/bill' on your billing statement - Apple Support

or go to Subscriptions and Billing - Official Apple Support