Telkom doesn't want to cancel my contract and I am still paying!!!!

I asked telkom to cancel my contract on the 13th of November which supposed to be expired on the 30th of November. they told me that it will be cancelled in 21 days which supposed to be on the 05th of December. since then i have been calling, 3 or 4 callcenter have asked me to send them my request which i sent to cancellation, but no one is responding. they are charging me every month, and also i had to deposit R1400 at the beginning of my contract. Telkom has to refund me my deposit back and also the money they are charging me a lot. This is so frustrating!!! why telkom doesnt give a reference number for the call??????