Telkom not cancelling my Account

I Cancelled my Telkom ADSL and Telephone line in store at N1 City end of October 2017 due to upgrading to Fibre with telkom still being my ISP. I Then emailed and called over 10 times and chatted to about 8 people on telkom online chat to get the issue resolved. The last lady from telkom "Nompumelelo Nok" i spoke to informed me that this will be resolved in 48 hours 3 April 2018. Ive now been being extra every month as this hasnt been removed and the excess amount has now been handed over and put my credit as bad due to telkom ! Please resolve this