I’m already pAying .99 cents a month why do I have to pay more?

If you're sure that those charges come from Apple (check your bank statement very carefully, ignoring scam messages that might be addressed to your iPhone), start reading this support page:--> Subscriptions and Billing – Official Apple Support, and check each of the first 3-4 sections.

If you cannot find the information you were looking for, please contact iTunes Store Support Team directly and explain your problem, using this specific link:--> Apple Support

Regards

Giulio

Assuming you are asking about iCloud storage, 99¢ a month buys you 50GB of iCloud storage. If you need more than 50GB you must pay for more. The next step up is 200GB for $2.99 a month.

Why do you have to pay more for what?