Great app until recently – Boomerang - Cartoons & Movies Review

I've been paying the same $5 a month for this app, but it has come to my attention that there's a $40 a month plan as an option as well. This offer was more appealing to me, however when I tried watching some Sylvester and Tweety, it keeps saying the payment wasn't accepted due to an error. I've tried uninstalling and reinstalling the app, but it's still refusing to work. Any suggestions that can help this?
Review by quequito1221 on Boomerang - Cartoons & Movies.