Dstv debited my account after I cancelled my subscription.

I requested that my DSTV be disconnected and that I did not want to continue on a monthly basis. I spoke to Seitiri Moloi. I received a confirmation email stating that my DSTV would be disconnected and no further payment would go off. I was just debited for August by Multi Choice. Now I can't get hold of any agents to have the debit order reversed.