Uncapped Costly Contract

I joined this pathetic Gym Company for my wife on the 06/04/2021 and took up a 3 years contract up to 26/05/2024. I honored all payments monthly until the last day, to my surprise they kept on debiting afterwards. We enquired and were told that we needed to write a cancelation email of which we did, still they keep on debiting. When I reverse/ block with my bank app the next month they do it again. I am sick and tired of this as it affects my credit score negatively as well as increasing my banking fees drastically so. I am now taking this matter to my lawyers. My advise to others will be to avoid signing contracts with Gym Company. If there was a score below 1 star I was going to definitely rate that.