Think Carefully Before Joining Virgin Active

I have had a Virgin active gym membership for the best part of 15 years but decided to cancel due to bad health. My membership had come to an end in June 2022 and I informed Horizon Virgin Active that I would not continue. They however, still billed me for July and to my surprise for August as well saying I had not cancelled in writing. I did this in writing as well although the calls are recorded! To my surprise, they billed me in September as well saying it was pro-rata payment! I received a call from them stating that they were not sure if I wanted to cancel my under age son's membership as well so I brought to their attention that I had made that clear to the accounts person so she said she was just checking so as not to bill me again. To my surprise (Well, not exactly surprised anymore), they billed me again end of October for my son's membership. Not sure what to do albeit change my account details!