Ridiculous Billing after the contract has expired

On the 5th of February 2016, the data contract for 2 Samsung Tablets expired. I used to pay R580 per month for the contract. In January 2016, I visited the Telkom mobile store to confirm the cancellation. I was told the system was offline. On the 27th of February 2016 I visited the Telkom store again and filled in the cancellation form to cancel the data contract for the 2 tablets and emailed it to Telkom on the 2nd of March 2016.<br> <br> The billing continued at the end of March 2016 after the data contract had expired. I was charged R1700 for the expired contract. The call centre agents were rude with bad attitude and said I deserve this billing because I don't know how to cancel the contract.<br> <br> I am really disappointed, angry and frustrated by Telkom. I have made numerous calls to their call centre, but still NO help. I don't know what to do anymore.<br> <br> Please help!!!!!! The data contract is still active and I am supposed to continue paying for the service I no longer NEED.