Trying to cancel services

Terrible service received from Telkom. You can conveniently open an account, telephonically and at any one of there stores, but should you wish to ever cancel there services, you have to e-mail and "wait 21 days" for cancellation. Which never gets done and they just keep billing you despite calling their offices numerous time with the only response that dont worry, if you sent a request for cancellation on the 6th March it will be cancelled on the 6th April 2018 and you wont be billed thereafter. Bull, you get billed and no one bothers to call you. I have been sending numerous emails, to ********** and ********** but not one seems to bother, this has been my last e-mail below: Nobody called back and a month down the line, they will bill me again:

Hi,

Please provide me with the amount and new invoice to make payment. I refuse to pay for anything after the 6th April 2018, because being a telecommunication company, none of you had the decency to call after the cancellation was sent on the 6th March 2018 and say that we unable to cancel your line because so and so. Nothing was appropriately conveyed, further to that, when someone is in arrears and cannot afford to pay and try to cancel the line, do you continue with the service and just choose to get them further into debt, doesnt make sense. You needed to cancel my line, firstly and then call for outstanding payment arrangements. Send me a new invoice with what should be paid up until the 6th April 2018, nothing more, or get your manager to call me and sort this out, I much prefer a "paper trail". so if they can e-mail me, that would be better, but im not willing to pay more then that, because I rightfully followed all instructions to cancel your services. Pull out my calls, when i asked to cancel, all the agent said was you have to complete a form and send it back and within 21 working days it will be cancelled, i followed up, the agent said nothing has been actioned yet, but it takes time and dont worry , if you sent it on the 6th March 2018, it will be cancelled on the 6th April 2018, nobody said, you have to pay your account before we can cancel, I promise you, follow this through because i intend to make a big thing about this and hold everyone liable. Pull out the calls. and get back to me, i want my line cancelled with effect from the 6th April 2018, i dont want to be charged a cent extra. You will see for yourself that your services were not even used irrespective if YOU kept it running, thats not my problem and i refuse to be held liable for your negligence.