Incorrect billing for 1 year

I bought a router in October last year on a vodacom contract, been having constant problems with incorrect data billing. I called numerous times from oct 2016 up until may 2017 to have the line capped which i was continuously **** to about that it was capped. Then in june 2017 when i called vodacom to once again complain about incorrect billing, i was offered to migrate my contract to a top up contract, which i agreed to and the contract was done over the phone. Now 4 months later, i am once again being over charged (******) by vodacom, as they have no record of my line being migrated to top up, even though there calls are recorded for quality purposes, which is an even bigger lie because they do not know how to deliver quality service. I had a top up router from 2013 to 2016 and i know exactly how to moniter my data. I have since Oct 2016 downloaded the vodacom app on my phone to track my data usage, and aswell was not concerned as of ending of june 2017 because i was told my contract was migrated to a top up and would automatically disconnect once the data limit was reached, but not so as i received an invoice of R1044 for the month of september 2017 to be paid on 1 nov 2017, where as my bill is approximately R639, R340 for my top up cellphone and R299 for my router. I have been trying for over a year to get my line sorted out but everytime i call it is like i am calling for the 1st time and have to explain the whole situation over and over again entirely. Can they stop being so inconsiderate and once and for all finalize my line to be migrated to a top up or at least even pull up there call records since i have been phoning them monthly with the exact same problem of being over charged and having my line capped and then having my line migrated to top up. It is frustrating and causes even more unnecessary stress in my life, and everytime a consultant answers my call they end up hearing a very angry customer shouting on 1 end of the line, because they try to patronize me as if i do not understand how data usage and billing works. I have been a vodacom customer for over 10 years and this past year has been the worst experience with them. Its a continuous **** from vodacom to keep robbing customers with ridiculous data prices. Please correct my november invoice as i have been constantly monitoring my data and in no way did i go above that usage, especially when my line should have been disabled when it reached 0.00mb. Please pull up my call records for the entire year because i am sick and tired of this nonsense not being addressed once and for all, i cannot be calling vodacom weekly/ monthly with the same problem, please address this matter urgently! Thank you.