Cancelled Policy Still Being Deducted

So, I took a funeral cover for my elderly grandfather a few years ago that am paying myself. Upon doing my financial analysis I realized that I don't need this policy anymore as I have him covered elsewhere. I called this company to cancel the policy sometime last year (2023) but they kept debiting my account and even sent an e mail around June 2024 indicating that I called in 2023 requesting a cancellation, but the debit orders are still going off. However, for the past few months there is still a tug of war between myself and this company where they debit my bank account, and I have to reverse the debit orders. My pain point is that these reversals attract bank charges every month and the debit orders are not consistent (different amounts every month) and now I have to be on high alert every month waiting to reverse and stop debit orders of which I have asked the policy to be cancelled.