Hey Annemiev,
Sorry to hear about the frustrating experience.
Adobe Export PDF is an online service, which is available as an annual subscription. FAQ | Adobe Export PDF, Document Cloud
https://helpx.adobe.com/in/document-cloud/help/using-exportpdf.html
At the time of initial purchase, you were informed that the subscription is set to auto renew and if you do not wish to continue then you can simply cancel the service from you Adobe account itself. Also, the customers get a notification at the 11 month of their subscription that its about to renew for another year. And if you wish to continue with the service then no action required.
I see that you have stopped the billing for renewal of next year. So it wont be renewing for you going forward.
Regards,
Akanchha