I like this app a lot but has a awful glitch

I subscribed to this app and I loved it and it was my favourite app, but somehow I was logged out of my account and now it wont let me log back in and is taking my money cause it says Im still a subscriber.... I am so frustrated with this because Ive been trying to fix it for EVER!!!!

Emmy 2 about Kylie Jenner Official App, v1.3.7