Why do I owe Apple $30?

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:--> https://getsupport.apple.com/?caller=ikb&PGF=PGF51002&category_id=SC0060&symptom_id=21084

(if you get no help, look at the bottom of the link, where you can contact them using "chat" or "phone" options).

Regards

Giulio

We are all users on this user to user only forum. We don't know you or have any way to know if you owe Apple or not.

Where did you get a notification? Did you read the link at the top of the page which brought you here?

Could it have been a Phishing Scam? See this --> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support