Cancel premium when you can't access or recover your account?

I signed up for premium and it logged me out of my account and now won't let me back in saying the password is wrong or let me recover my account. Does anyone know a way to cancel a subscription when you have no access to the account and the provider of the subscription has no customer service you can contact? Or am I gonna need to try and sort it out with my bank?🙃.

I had no recovery email set up even though I thought I did and after I signed up for premium it asked me to add a recovery email. I went to settings to do that and it logged me out and now I have no recovery email to recover the account with and am being charged for a subscription I physically can't not cancel or even access. 🥲.