Still no response to cancellation request

Good day - I have been trying to cancel my account since 30 Dec 2015. I have mailed you repeatedly, and I have called repeatedly (I can supply dates and copies of emails). I then complained on Hellopeter on the 7/1 and was given a reference no of SM184773. I wrote on your facebook page and was given a cancellation number of ***A. I called (again) on the 11th of January at 11:57 and was told that I would, without a shadow of a doubt, have received a call back from the relevant official by the 20th of January. It is now the 20th, and yet I have still not had ANY communication from Telkom. I don't know if my account has been cancelled (as promised and indicated by the number above). I have no idea for WHEN the service is cancelled (what is the last day of my contract, please?!). I have now asked, begged, e-mailed, phoned, and complained enough - tomorrow I am taking legal action. Perhaps a lawyer's letter will have the matter resolved? Apparently being a good customer for 15 years does not guarantee good return service - I am most disappointed. I wanted to move my line to my new town - now I won't make use of Telkom ever again.