Unauthorized Netshort Charges Not Showing in Google Play

At the beginning of August, I started using an app called Netshort and later deleted it. However, approximately $78 in charges were made through my phone line without my knowledge or authorization. Since these charges do not appear in my Google Play purchase history, I cannot even see the dates or details of the transactions.

When I contacted Vodafone customer service, I was told that I needed to contact the app directly. However, I could not find any phone number for Netshort, and I never received a response to the emails I sent. As a result, I cannot determine who charged these amounts or for what transactions, and I have been unable to find anyone who can address the issue.

I request that these unauthorized charges made through my phone line be investigated, that all subscriptions or memberships associated with Netshort be canceled, and that the approximately $78 charged to my Vodafone line be fully refunded.