One possibility for a 99¢ monthly charge is an iCloud storage plan that has been upgraded from the free 5GB to a 50GB plan. You can use the following instructions to view or cancel the storage plan.
Cancel upgraded iCloud storage by downgrading to the free 5GB plan. See instructions in the following Apple article: Downgrade or cancel your iCloud+ plan - 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. 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