Extremely poor service

I had a contract with Telkom mobile and it expired in sept 2015. I wanted to cancel it but I was told by an agent Nontutugo on the 22.09.2015 that if I wish not to cancel, I can go on a month to month basis, still receiving my 5GB data, 150mb data & my 100 minutes for only R99. On the 25.09.2015 I paid R198 as I have two contracts with them. I received my new statement on the 02.10.15 and my bill is over a R1000. I logged a case on the 03.10.15 and spoke to Michael Hakee ***6 who told me it will be sorted as this is an error on their side. I called the 05.10.15 & spoke to Queen Mhlongo who then informed me that she will log another case as Michael entered the wrong notes. New case No. ***4 & was told that their turn around time is 72 hours. Today is the 14.10.2015 and up until now, I have received no feedback as yet. I am disgusted by their service as I have spoken to 7 agents 2 supervisors (Kenneth Mtethwa, Smangaliso Ngcopo, Noluthando Mlambo, Mpho Moagi & Tumelo Madisha ,Aphiwe Gwanya) I have been told told different stories by different agents, some dropped the phone in my ear, the others had me on hold for 20 min, some refused to let me speak to a sup. I am frustrated