Struggling to cancell contract

I have a 24 month mobile data contract and in my 18th month. I went to Telkom store on the 07/08/2017, filled out the form and the lady emailed it stating that someone will call me with 21 days. Case No ********** 4. I received no call but just an sms stating that my case is closed. I then called the call center and spoke to Siza kele on the 30/08/2017 requesting my contract be cancelled and why was the case closed. She then logged another case ********** 4. And said some one would call me today or the next day. I waited no one called me. called again on the 31/08/2017 Spoke to Mduduzi and I explained I want to cancell my contract. He also asuured me some one will call me but no one called. I called again on the 02/09/2017 spoke to Brandon Mvune case no ********** 8. I am still waiting ... Telkom the contarct I have is too expensive, I have opted for ADSL. You signed me up and I was connected withing a week. Why are you making it so difficult to cancell my mobile contract ********** 023. As far as Im concerned i have give you 30 days notice and have paid my August bill and will be putting a stop order for September instalment. Kind Regards.