Hi, sorry to hear that and thank you for your comment! We are constantly working on the improvement of our product and we test it before uploading to any of our stores. Do you mind describing what exactly doesn't work and how you are trying to play the audio? It could help us a lot in identifying and solving the problem.
About the monthly subscription: every our user gets free listening time every month but if our user wants more listening time, we have two plans with annual and monthly subscriptions. The platform Intelligent Speaker works on is not free and we do our best to minimize our users' costs, that is why we charge the minimum, to cover our own costs.