Trying to cancel mobile contract since MAY 2017

I've been trying since May 2017 to cancel a mobile contract! I took out an ADSL line instead and the consultant that sold me the ADSL did not send my cancellation documents through (proof of which I have on email) and since then I've sent it to ********** numerous times as well as to telkom call center consultants, the other day just to find out that the case had been closed without reason yet I am still being billed for the contract and have not used a single byte since I sent through the cancellation!!!!!! I want this contract closed as it is negatively influencing my credit record AND refunded for debit orders incorrectly coming off from June 2017 to date!!! Number in question **********