What makes you believe that iTunes is charging your $75? Did you receive an email, or other message? Have you checked your purchases or bank statement to see if it appears there? If so, see this. If you see 'itunes.com/bill' or an unfamiliar charge on your bank, credit card, or debit statement - Apple Support
If it was just an email, see this, as it could be a phishing attempt. This will help identify fraudulent messages and what to do with them. Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support