eDreams Refuses to Stop Unauthorized Weekly Subscription Charges

I booked flight tickets from Melbourne to Sydney in September through eDreams for a Jetstar flight. After this purchase, a subscription I was not aware of started, and since 26 September I have been charged $17.99 every week without my clear knowledge or consent. When I noticed these weekly $17.99 payments, I contacted customer service about five days ago and was told that the subscription had been cancelled. However, despite this confirmation, I have again been charged $17.99 today, so the issue is clearly not resolved and the unwanted subscription is still active. I request that this subscription be cancelled immediately and permanently so that no further money is taken from my account without my permission. I also ask that all weekly $17.99 charges that have been debited since 26 September in connection with this subscription be fully refunded to me, as I did not knowingly agree to this ongoing payment.