Contract cancelled but debit order still continues

<p>I cancelled a contract with Vodacom-it was acknowledged by them in writing and loaded for prepaid. However my debit order is still in place and retentions tell me this is in order-see below</p> <p> </p> <p>"</p> <p>Good day</p> <p> </p> <p><br />Theres no refund due. Your debit order was on 1st of each month. Billing is correct.</p> <p> </p> <p><br />Regards</p> <p>Retentions back office "</p> <p> </p> <p>So I am being debited *******ly and their own billing department refuses to acknowledge the cancellation ???</p>