Telkom Mobile - Breach of contract.

During Jan 2015 we entered into a mobile contract with Telkom mobile which turned out to be a total failure due to no reception. After lodging an urgent complaint we were told that a technical team will have to verify the no reception problem which was done and confirmed after a few months. On a follow up we were again told that a second team needs to verify the no reception which was done and confirmed again. Telkom confirmed that the contract will now be cancelled as we were paying R1599 pm for no services. However Telkom keeps on debiting my account whereupon the debit order was stopped. Although we have stopped the debit order Telkom keeps on debiting my account numerous times per month ignoring the fact that the contract has been cancelled and no service available from Telkom. We do not even have use of the sim card which was used for business purposes and consequently losing business due to the fact that our mobile no is non existent. What Telkom mobile advertise and what you get are two worlds apart. Your urgent assistance will be highly appreciated.