Quizlet Subscription Cannot Be Canceled and Continues Charging Me Monthly

I purchased an annual Premium subscription through Quizlet, but I am being charged approximately 500 TL per month on my mobile phone bill. I purchased this subscription in October, and since January, I have repeatedly tried to cancel it, but I have been unable to do so.

When I select the “Manage Membership / Cancel Subscription” option within the Quizlet app, I am redirected to Google Play. However, the subscription does not appear in my Google Play account, so I cannot complete the cancellation. The only place where I can see this subscription is when I select “View Bill Details” on my mobile phone bill. As a result, I have been forced to continue paying for a subscription I cannot cancel for months.

I also contacted Vodafone, but they were unable to assist me. Since the subscription does not appear on Google Play, I am repeatedly being redirected between different parties without being given a clear point of contact or an effective way to cancel the subscription. The fact that I cannot cancel the subscription myself is causing me significant financial harm and frustration.

I request that Quizlet and all relevant parties urgently cancel this subscription that is not visible in Google Play and ensure that no further charges are added to my mobile phone bill. I also expect a clear explanation of why the subscription cannot be managed through Google Play and why I have been unable to cancel it despite making repeated attempts since January.