Refusing to cancel my contract

I have had a membership with virgin active and everything was going well I never missed a payment. Until I fell pregnant and asked them to cancel or freeze my membership since I can't go to gym but they refused. So I continued paying for something I don't use for the whole year from 2020 until 2021.then in November I called again to cancel they agreed and said it is canceled and they did not debit I December. January boom they took my money again I reversed it and got charged for that. I called them again and they said it is sorted out. And again today they debited again and my account is on a minus now because of them. Like I mean there is a lot of money that I have paid them without using their services. Ever since covid started and now they are still doing this to me. What must I do? Now I don't even afford the gym anymore so that is another reason why I had to totally cancel it.