Why was I charged $5.99 for storage? My previous monthly fee was $.99. Isn't there a $1.99 option?

iCloud storage plans in the U.S. are 99¢, $2.99, and $9.99. I suspect that you were charged for something else.

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