Cancellation of contract

I sent through a cancellation for my contract in December 2017 and Telkom still hasnt cancelled it despite me contacting them in Jan, Feb and now March. I have e-mailed the form to numerous different people after calling the call center. After 5/6 calls and over 10 e-mails. I am highly frustrated and will take Independent Communications Authority of South Africa. I have asked my bank to cancel the debit order as this is ridiculous!