Unexpected multiple charges on Apple Account

Why have I been charged 17.99 twice and 72.05 for a story on line. I agreed to 17.99 once but I’m not paying 150.00 for a story. I’m not finished and now they want more money total scam

[Re-Titled by Moderator]

Original Title: i have been charged 17.99 twice and 72.05 and now they want more to finish this story. i agreed to 17.99 monthly but didnt want to pay 150.00 to read this story