Is Valence a monthly Subscription?

I bought Valence 3D recently (on 13th August). I checked my banking app today and I have incoming subscription from Apple with the exact price of Valence 3D to be charged on 13th September. I can’t block Apple, because I use Apple Pay for online shopping. Not sure what I should do, I was sure Valence was one-time buy? Is it an AppStore issue? Should I ask for refund?

It was only a one time purchase. I would contact apple support.

its a one time purchase!