i was charged 20 dollars more show i bought on YouTube than what it said it was gonna cost

You need to contact iTunes Support. This is a user to user only forum. We have nothing to do with billing or your account. Here is how to contact them --> Contact - Official Apple Support

Also, if you're in the US, you can call Apple at: 800-MY-APPLE

Describe the process you used to purchase the season on your device. Does it show in your Purchase History here:

View your purchase history for the App Store and other Apple media services - Apple Support