Vitality confusion

My Vitality contract was cancelled at the end of July last year despite my making payments every month. I was unaware of this and continued making payments. I have not been given a credible reason for the cancellation and now when I want to be refunded for payments made after the cancellation, I am coming up against a brick wall. I have emailed proof yet get a reply from a different person every time and have to start the process over every time. Can ONE competent person please help me sort out this muddle. Paul Glaser, Membership number - ***