Discovery debiting my account *******ly

I am hoping that someone can assist me with this. I am trying to cancel a debit order that has been running for 6 months now and discovery refuse to stop the debit order and i keep having to pay penalties because of them as well as its dropping my credit rating. I asked yourll to stop debiting my account, you are debiting it and its unauthorized. This is my last chance to get you guys to stop as I will be proceeding with legal action against yourll as yourll are taking money out of my account without permission.