There is definitely an option to stop a subscription because many users do it. You probably had not stopped subscription, which is why you were charged again.
We are unable to handle issues related to subscription. Only the support can do that. Please reach out to them. If it was an error, I am certain they will help you.
There is a tab called 'Help' at the bottom of this page. Please click on that and then write to them with your issue.
Raadha Kalpa Team