Unauthorised Debit order

Please note I’m not happy with the service I received regarding my Gym membership and debit order. On the 04th January 2021 I called Moove Gym Cosmo city to confirm when is my 24 months membership expiring because when I checked on my profile it showed that my last debit order would be on the 25th November 2020 but my account was debited in December 2020. So I called to confirm if my membership is still active or not as my account was debited and I was advised that unfortunately my membership has ended on the 02nd January and the last debit order was in December 2020 and obviously never used the gym membership for January as I was advised that my membership has ended. To my surprise this morning another debit order went off my account, and I called and spoke to Portia who confirmed that the reason why my account was debited is because I never send a cancellation notice! but how do I send a cancellation notice when I was told that my membership has come to an end? And apparently when a contract comes to an end and a cancellation notice is not received, then the membership will automatically be continued. So apparently this was supposed to be explained to me prior to joining the gym and no one did that , but my other question is why was this not explained to me when I called to check my membership status on the 04th January? I demand my refund as I never used your services after being told that my membership has ended and I never gave any consent that I want to continue with the membership.