I Am Demanding a Full €39 Refund From Hint App After an Unexpected Charge

I recently discovered a charge of 39 euro on my account linked to an app indicated as “Hint app QN72P wilmin”. I never activated any subscription or gave clear consent for such a payment, so I consider this charge unauthorized and not transparent. I did not previously contact the app’s customer support or the relevant store, because I found your platform while searching for information online. I would like this situation to be checked carefully, as I do not knowingly have any subscription or paid service with this app. My clear request is a full refund of the 39 euro taken and the immediate cancellation of any possible subscription or recurring payment connected to “Hint app QN72P wilmin”, so that no further amounts are charged in the future.