I can't cancel my subscription!

Please guys I need help! I created an account for the 30 day trial and that's all I wanted. Before the trial end date I deleted my account, which was a mistake, because now I can't access my subscription to cancel it! I can't even use the subscription I paid $66 for... I'm so sad and worried that I'll have to keep paying this forever without being able to use it!

Edit: I've contacted Musescore by email a bunch of times and all they send back are robot replies that don't even address my problem :(