Failing to Cancel Debit Order

Telkom has after 3 months still failed to cancel debit orders on a contract which I canceled after the 24 month period has expired. Did everything and more from my side to follow their procedures. Sent contract cancellation forms in 2 months prior to 24 month contract finished. First month after the contract finished the debit order obviously remained active. Contacted customer service, and sent through all relevant communication to them, but off co**** the next month, the debit order remained active. Called customer Service once again and after another 20 min wait, same procedure. The debit order remains active, after the last month end. Have no idea what these Telkom Customer Service representative are there for. This situation is an utter disgrace for and ******* thereby as well. How many people do Telkom have on contract in any form with debit orders purposefully not getting canceled. Robbing us blind!