Unresolved migration - deduct double payments

In April 2015 we migrated from the Promo 5 Package to the Futurehood Mobile Internet Package at Telkom Mobile. Within a few days we received our new rooter and started using the new package. They ensured me that the previous package would be cancelled and that a courier would pick up the old rooter from our house. This never happened and we still have the old rooter. When our debit order went off the next month, it was for both packages. I phoned the call center several times and spoke to a manager (Anita) who assured me that the old package was cancelled on their system. When the next month came we once again paid for both packages. Since then I have made numerous calls to Telkom Mobile, visited several stores and every time I get the same response - On their system the old package has been migrated - They also told me that they could do nothing else for me as I need to take matters further by using their online service. This also seems to be a dead end. I demanded that they stop deducting for both packages, but no one seems to have an answer for me.The lack of service and customer care disgusts me. What else do I need to do to get reaction out of Telkom on this matter???