You can change your Apple ID email address on your current Apple ID so you retain access to your data and prior purchases. Note the restrictions in the article.
Apple ID Name Change. *
Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
What to do after you change your Apple ID or password - Apple Support * I suggest doing this before you change your Apple ID or password.
For the movie, are all devices using the same Apple ID? Have you downloaded the movie on all devices? What happens when you try to watch the movie on the other devices? Error message(s)?
Normally, all sales are considered final, but you can ask for a refund. See the articles below for instructions on filing for a refund.
If you have received a confirmation email, click the Report a problem link at the bottom.
Request a refund for apps or content that you bought from Apple *
How long refunds from the App Store or other Apple services take. *