Cancellation of month to month contract

I have had the worst experience ever with Telkom. After 2 years of their my contact I called in the 20th and spoke to Vanessa about cancelling my contract. I called Telkom again on the 29th around 12:25 pm after noticing I’m not getting any phone notification on the cancellation of my contract. This time I was speaking to Bonolo. My contract was now a month to month contract. At times I would pay the amount they requested because they froze my services. In all the communications I had with Telkom consultations I requested a ref number but they couldn’t provide but can only provide names. I finally spoke to Lindiwe Duma on the 10th of April 2019, another customer service representative who also promised I’d receive a call from cancellations on my alternative number in the next 24 hours and I didn’t. Lindiwe even shared emails that were sent between them and cancellations on the 29th. I’m at my wits end, I do not know who to talk to anymore. My bill keep pulling up on the services I don’t use. Now Telkom wants me to pay 1200