Hi morelora,
I've checked your account using the email address that you use here in the forums--there are no subscriptions tied to that email address. So, that likely means that you either signed up using a different email address (Adobe ID), or signed up via one of the mobile apps (via an app store).
That said, the subscription that I think you're referring to (ExportPDF, which costs $19.99/year) was never free. We do offer free cloud storage, so maybe that's what you're thinking of.
In any case, you can either follow the instructions in Cancel your membership or subscription | Acrobat, Acrobat.com online services, or Contact Customer Care if you purchased your subscription from Adobe. If you purchased via one of the mobile apps, it's necessary to contact that app store for cancelation, as Adobe doesn't handle those subscriptions.
Please let us know if you have additional questions.
Best,
Sara