Miway deal breaker

I am asking myself what more can I do. I had a car insurance policy with miway since 2018 November. In February 2019 I was involved in a car accident fortunately not leaving me with major damage. When I claimed, well as expected I was told it is a less than my access fee therefore I must fix that myself. I had no problem and the policy continued. But then in January 2020 I got a better offer, where I will pay lesser amount on my car insurance. I alerted miway via an email to terminate my contact. Miway did not do that. They are still debiting my account to date. What more can I do to say please stop debiting my account? What makes it so difficult to honour my request?