Cancelation of my Telkom service

On the 17 th February 2017, I canceled my service with Telkom, in that we went fibre optic on our Estate and it was supp**** by Vodacom. I sent all the relevant documentation to cancel everything related to Telkom. For the past 12 months, I receive a nasty SMS on my cell phone requesting me to pay the outstanding amount , which monthly it keeps on getting larger and larger. At the moment it stands at R2066.89. I have spent time talking to numerous people at Telkom to resolve this as I was fully paid up to the end oh February 2017. It seams that Telkom has no clue what is happening in the billing department.