Stop My Subscription DramaWave

I signed up for a weekly Dramawave membership for 9.55€ and had previously subscribed and watched content without any issues. However, I now want to cancel my membership and cannot do it myself because the subscription does not appear anywhere. I've been charged 17,32€ now and I'm unable to stop it. When I go to the “Subscriptions” section in Google Play, my Dramawave subscription does not show up, so there is no option for me to cancel it. The subscription also does not appear as active inside the Dramawave app. Despite this, I am still a member and cannot stop the renewal by myself. I contacted Dramawave but did not receive any response. I request that my Dramawave weekly membership, which started on 31 July, be canceled immediately. Since the subscription does not appear in my Google Play account or in the app and I am technically unable to cancel it myself, I demand that my membership be terminated without any further charges and that this issue be resolved urgently.