SHOWMAX DEBETING MY ACCOUT WITHOUT MY KNOWLEDGE AND APPROVAL

I bought Showmax on the 7th of February 2024, and ensured that it was a once off payment, but no they keep debiting my account without my knowledge or approval after the subscription had expired. I was debited on 15 March 2024. This is ***** as I did not give them the permission to debit me every month. I am actually ****ed because this is the second time they are doing this. Even in 2022 I had to dispute when I tried the trial version and they debited me after the trial without my approval. if it happens more than once it means it was done purposely with the hope that I would not notice, I need the money to be reversed