Faulse debt with Virgin Active!

I started a 12 month gym contract with Virgin Active Red in Maynard Mall in August 2017. I called in to cancel the contract in 2018 after the 12 month contract ended. I then noticed that Virgin active was still debiting my bank account, afterwards. I reversed the charges at my bank and I went to Virgin Active Red in Maynard Mall to complain - the staff advised I need to contact their call center from there and I did so. My call was handed over to a MANAGER who confirmed that the contract will now definitely be cancelled and apologized for the inconvenience. Recently I have been receiving notifications that my Virgin active contract is still running and I owe them money!!!! I am furious about this as I wanted to go back and open another 12 month gym contract as I am now mobile and ready to go back to gym. How do I prove that I have cancelled? Tell me how long it will take to obtain my call recordings for the occasions that I called in to cancel this?