Telkom bad service and overbilling stunts

I'm a Telkom customer with the big deal 10G mobile data,10G night surfer, My first issue was that when I signed up I specifically requested the consultant to keep my contract to a fixed amount so that I don't exceed my allocated data and overbilled for it, I spoke to several agents who sent me from pillar to post, however, my biggest nightmare occurred in the month of May 2019, I have been making use of this service for over a year now and my data bundle is loaded on the 1st of every month and usually runs out close to the end of every month between 28,29 or 30 with my normal use accessing my emails and stream for 30 minutes weekdays without fail, suddenly on the month of may I started experiencing connection dropouts and on the 5th day after my bundle was loaded I failed to connect,error message "out of data " I immediately logged off and went to bed with the hope it was a connection issue, I contacted Telkom to query why I suddenly ran out of so soon and requested for an investigation considering that I had only used my router for 5 days after it was reloaded yet and requested audit report, In all instances I received to response pertaining my case and every time I would call I was informed the case was closed because Telkom did not find any foul play, so I requested for a report details their findings and all I was furnished with is an excel spreaheet showing logs of login start time and end time, I I have begun to question it because it didnt make logical sense that the logs show my number connected on the 8th yet I was disconnected on the 7th, So I reopened an investigation and requested for someone with a technical background to look at trends and analyize if it makes sense that I had used my 10g plus 10g night surfer inclduing over exceceed my limit over my R500 in less than 10 days yet I had not been streaming but only checking my work related emails on the machine, I was told it could be numerous reasons such as updates on my Laptop which was pure speculation, To this day I havent received any feedback around up until yesterday when I received a notification saying i was over billed R500 more, I called their billing department to find out exactly what I was billed for especially considering that I had a despute about my 10G data which I have no tangible proof was allocated considering how suddenly this month I could ran off data so soon yet there was no excessive usage, I called and asked the consulant to explain as an example " How is possible that you reload R30 Airtime voucher and make a call to an MTN number and speak for 1 hour and you do the very same thing the next day and only speak for 5 minutes yet you are doing the very same thing and get different outputs and thus far I have not received any positive or tangible feedback.When I contact their call center I am told that records on the system say the data was used but they do not have a system in place to show who used the data including the activities involved but the only thing that the logs show is that my mobile number connected at those time which I already disputed the use of the connection at 12 AM to 12 PM which is my working hours, No one is Technical enough to give me an explanation through their findings without saying the device was connected not even looking at the possibilties of my account making use of multiple devices , Telkom had to ask me how many devices are connecting on my Modem, Further I requested them to compare my logs to any other month and tell me what had changed or worked out differently,My data was reloaded for the month of June and everything continues as normal after they debited close R700 in my account for a 10GIG worth of data.