Two year Telkom LTE subscription runs out, debit order continues after stopping it at ABSA

We have had a 2 y LTE contract, ending May2018 - endless trouble with wifi, After many complaints, they promised to put up an antenna one year ago - never happened. Phone call from Telkom in May 2018 to remind us that the subscription will run out - we cancelled, afterwards sent an email from Telkom website when phoning did not succeed, wen into Cresta shop to cancel, spoke to manager Mario who gave email address to cancel on 02/07. Received ref no ********** 3. On 05/07 received email that case has been resolved Dear Valued Customer, Your case no ********** 3 is resolved. Please call 081180 for Telkom Mobile related queries and 10210 for Telkom Services and Products related queries. Regards, Telkom | Business Connexion Debit order has been stopped online + physically in ABSA - they have gone through every month including today. How do we stop Telkom from taking our money?