Can't buy anything – ACK Comics Review

I just keep getting a message that says "you don't have permission to purchase this book" every time I try to purchase a book or subscription. Update March 27, 2019 App was updated. Had high hopes. Launched it, downloaded my books. Subsequently app just crashes on launch every time. Unusable. Wasted money on buying books I now can’t read.
Review by the toxmeister on ACK Comics.