Discovery refuses to cancel debit order

I have paid for my daughters medical aid by debit order. In December I instructed Discovery that I would no longer allow the debit order to be paid through my bank account. The debit order did not go through in January but has now continued in February. I have now been told by my broker that Discovery cannot stop a debit order. ??? I have to go to my bank and stop it. <br> Well Discovery I have been a loyal member for many years but I now choose to completely cancel both mine and my daughters debit orders and cancel my medical aid with you completely. <br> You do not have the right to my bank account as you please. <br> I am on my way to my bank to stop you!<br> Tracy Rankin