I’m charged monthly $.99 by apple.com/bill and I do not know what is this.

Two possibilities:

A subscription: How to cancel a subscription from Apple - Apple Support

or

an iCloud storage plan that has been upgraded to 50GB: Downgrade or cancel your iCloud storage plan - Apple Support

If neither of the above helps, note 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: https://support.apple.com/en-us/HT201382