Telkom incompetence

I cancelled my Telkom account in July 2017 via email which i was advised by the call center when i called to send my ID and cancellation request. I did not hear back from them and received a call in December 2017 querying an amount outstanding of 1700 which Telkom has now charged me for their incompetence of cancelling the account and expect me to pay for their services which i did not even use from July 2017. My account was only cancelled in December 2017. Now they have handed me over to a Debt company to collect their money and this has now had huge impacts on my credit profile and affordability. I am trying to lease a flat and have requested a letter from Telkom to acknowlegde the account is cancelled and no debit orders are active for Telkom . I have been to their local store and contacted the billing department which they advised was the best approach and not deal with the debt company. I then waited 15 minutes for Tshiamo from Telkom Billing department to waste my time and says i need to wait for the debt company and i need to deal with them and when asked to speak to his supervisor or manager he rudely told me there is nothing his manager can do and his manager Sibingile Vilekazi advised him as such. I want to thank Telkom for their exceptional service and for messing up my credit profile. I now cannot lease a property due your excellent standards and putting your customers first .