GeoZilla Hidden Subscription Charges and Unable to Cancel Plan

I downloaded the GeoZilla app and used the free option once to try to locate a friend’s phone, but it did not work. Afterwards, I was charged about 3€ through the Apple App Store, which I consider money paid for a service that did not function as expected. Since then, GeoZilla has repeatedly tried to bill me further amounts of around 30–40€. These payments have not gone through only because there was not enough money in my bank account at the time. I never clearly agreed to such an expensive recurring subscription and I cannot find any active GeoZilla plan to manage or cancel. I have tried to cancel this subscription through the GeoZilla app, on their website and in the Apple App Store, but I cannot see any subscription listed, so I am unable to stop these billing attempts. I also submitted a complaint to GeoZilla but have not received any response, which is very frustrating. I request that GeoZilla immediately cancel any subscription or recurring payment associated with my account and confirm in writing that no further charges will be attempted. I also ask for a refund of the 3€ already charged, since the service did not work and I was not properly informed about any ongoing, high‑priced subscription.