Incorrect bill

It saddens me to turn to social media to complain but I am paying for a service I cannot use and furthermore I am not receiving any help from Telkom. To date I have submitted over 9 disputes. All with the same outcome rejected and furthermore no reasons were given for these rejections what makes this worse is that Telkom has taken more than a year and they have still not provided feedback. My story begins as such. In October 2015 I took out a LTE contract with telkom which was that I would get 20GB of data per month in the morning and after 12, for a total of R399 pm. Upon taking out this contract I had asked the store clerk to ensure there was a cap on the account, so that at any point I will not be billed more that what is required to be debited which was the R399. She said that she can't make it R399 but R499, which I was happy for her to place at. She went on to assure me that had I finish my internet for the month I would need to buy more either by levying the amount on my account or by using my credit card to attain more Gigabytes. In the first month I was charged a pro rata rate. However in the second month is when my problem began. I had received a bill for R5698.27. Upon receiving this I had immediately contacted telkom billing. Speaking to the attendant she assured me that this was erroneously calculated for the total obligation. This did not make sense to me so I had asked to speak to a manager. The manager of the billing department had informed that I should not worry the amount I am seeing on my bill as this is the amount that would be required to be paid over the contract period, but however telkom had included this on 1 statement. Now that this information came from the billing manager, I felt calmer. However in December 2015 I was contacted by the credit department of telkom requesting I make payment immediately or face penalties. I had explained specifically what was explained to me by the billing manager to the credit department but she did not seem to understand. She informed me to log a dispute which I did. However this did not solve the problem. My dispute was rejected and I did not recieve feedback about this being rejected when I asked for the reason as to why it was rejected no one could provide a reason. In January 2016 I sought help from the store manager of the store I had taken the contract out with. He too assured me telkom made a mistake with the calculation of the billing and ensured me that he will have this sorted by end of the day. I will mention now this gentleman has logged 8 disputes for me all with the same outcome, rejected and furthermore this gentleman made promises he could not honour, be it feedback, sorting the issue out or adhering to ETAs I've heard it all from this store manager i have sent him multiple sms' s all which were ignored. It's over a year I have not gotten anything back I am paying for a service I can barely use but Telkom wants me to pay for a bill they cannot explain and how they got to this calculation. In short I have had the worst experience with telkom. All I want is to be remedied. I have paid all this money for a service I could barely use and up till today telkom still continues to debit my account for not just 399 but 500 a month. This will most probably fall on deaf ears as usual, because Telkom only cares about money and not for their customers. So if you are reading this do yourself a favour pay that little more extra and go to a competitor I can guarantee you, you will have peace of mind and also you will be valued as a customer should you have a problem. I will definitely be trying to put this on all social media platforms as soon as I can, because I am done waiting for a company as reputable as Telkom to take me seriously.