Why am I being charged $2.99/month?

Also check your iCloud storage. You can do this in Settings>iCloud or at https://www.icloud.com - sign in and click 'Account Settings'.

If you have 200GB of storage, the cost of that matches what you are paying.

If you see 'apple.com/bill' on your billing statement - Apple Support

Did you happen to upgrade your iCloud storage to 200GB/month? You can check your current iCloud storage level: Settings > [Your Name ] > iCloud and look at the top of the screen under STORAGE.