Deducting money after cancelation of contract

My husband has a rain account which we have been paying from my bank account. In November we çancelled our rain account due to poor connection. They then deducted money at the end of November. Now on 23rd December they deducted money from my account again. There is no way for us to stop this because they have saved my card details and they have been doing recurring payments without being given permission to do so. In the beginning of the contract we used to make payment ourselves because we were told that it was a month to month contract but for the past few months we could not even decide if we wanted it for that specific month because they just automatically deduct. We are unable to remove our card details. How long is this going to continue