Can't get my Vitality account canceled

I was contacted to join for a free trail on Discovery Vitality, after joining I received an email confirming my free trail membership, after a day or two we decided to cancel the free trial because we did decide that we are not really going to be able to be active enough to reap the benefits. I rep**** on that same email that I want to cancel, but after 3 months the debit orders started to go off, I then contacted Discovery to find out what was going on, they first wanted the proof of cancelation, which I send to them via email, I also spoke to the cancelation department to confirm my cancelation via email and that all the funds deducted from my account must be refunded, a month later I phoned Vitality and the operator told me that my Vitality is still active and not canceled,. Since the first email I send to cancel was in June 2021, I don't know what to do, because the money again is going to be deducted again, I stopped the debit order at the bank, but my manager said they just use different codes and they deduct the funds again