why am i being charged . 99 per month for a service i do not use?

The support article "If you see 'apple.com/bill' on your billing statement" explains how you can check your iTunes and App Stores purchase history, cancel subscriptions, and track possible sources of unrecognized Apple charges you may see on a bill. These may be purchases by family members if you are an organizer of a Family Sharing group, or possibly a second Apple ID you use. The article also provides a specific link for contacting Apple if you cannot trace the source of charges. Click on this link to read this article ➞ If you see 'apple.com/bill' on your billing statement - Apple Support

You are only charged for things you purchased. To review your purchases, subscriptions, and billing details, visit support.apple.com/billing.