Telkom Refuses To Cancel My Contract and Keeps on Debiting Me!!!!

My mobile contract expired with telkom in last year Nov 2017 , I have sent cancellation forms and request twice already one on the 14 Nov 2017 and again on 02 Jan 2018 and yet i am still being debited every single month!!! I want these debits to stop , because you are taking money for a service i am no longer using which is *******!!! And i want my refunds for all 3 months you have been debiting me out of contract ASAP!!!! I was even escalated to an Team Leader Sibongile Malinga by Kelvin Elton , and he didnt even bother to contact me once!!!