Multichoice still debiting my account - months after subscription is cancelled!!!

Three months ago I canceled my subscription with Multichoice, but they are still debiting my account! WARNING to anyone who plans to pay via debit order - don't do it! I have contacted their contact center and they repeatedly told me that they don't have me on their record and that I am no longer a customer - but when I asked them - how come you are still debiting me - they have no answer! If this is not theft and ***** - nothing is!!!! Beware of dealing with them - they are a bunch of ******.