App subscription not working

On April 1st I subscribed to the tamagotchi forever app, it is supposed to last a month, but suddenly today it says my subscription is expired after only 7 days. On iTunes it says I am subscribed, yet on the app I keep getting pop ups that my subscription is expired, and I am getting all the ads that I paid to get rid of. When I click resubscribe, it tells me I already am subscribed. It is very frustrating and it seems like I got scammed. How do I fix this?