Incorrectly billed (Next stop would be the ombudsmen)

In March 2018 I had gone to Telkom Trade Route Mall Lenasia. I had requested to obtain a 4MB ADSL line only on a month to month contract without the router, I had registered to obtain data from another vendor. I had completed the full application form and submitted the necessary documentation. Thereafter a gentlemen arrived at my premises to install the line and brought a router. I had informed him that I had never requested for the router and it has to be returned back to Telkom. To my surprise the router wasn't sent back to Telkom by the technician and I was requested to file an affidavit at the Lenasia police station (This was the first to many inconveniences). The real concern was realised when the first debit order went through of an amount of R663.17 this immediately raised a concern as this wasn't the amount which I was supposed to have been billed for just the line rental. I had visited the branch in Lenasia and I was informed by the consultant who assisted me initially with my application that he isn't able to assist and I need to visit the Glen Telkom branch. Immediately I drove to the Glen Telkom branch and was provided with my statement and also informed that I had been placed on a 24 month contract. I had gone back to the consultant who had initially assisted with my application and informed him of the error. I had been asked to type out a formal complaint however to date I have got no success in resolving this matter. I have visited the Telkom lenasia branch on numerous occasions to speak to the consultant and he hasn't offered any assistance in ensuring this matter is resolved and neither does the assistant manager (The assistant manager hasn't even tried to assist neither has he left his office to assist). This issue has been going on for the last 4 months and I have been billed incorrectly for this period of time (I've been told that I will be billed for August as well as the matter isn't fixed). I had received a call from the complaints department at Telkom however haven't received any feedback or resolution for the last two weeks.