None communicating of billing procedures

Good day,<br> I have been struggling to sort out my August bill since 2Sept 2015. I have a mi-fi rooter contract with Auto page. The contract gives me 2gig daytime and 2gig night time data. I phoned the call center 6Aug to confirm my usage. I was told I've used 928 mb to date of my contract data. I immediately loaded another data bundle for 2 gig. End of August get a huge bill? After numerous calls on 2/9, 9/9, 10/9, 15/9 and 18/9, I get an itemised bills showing R910 billed for data on 5Sept,the day before it was confirmed to me that I only used 928mb of my contract so far? After being on the phone for at least 60minutes on and of, explaining again and again, I speak to a manager , Evans, who tells me that there was a 2.2gig download on 5Sept which all was billed as out of bundle, even if I did have data available on my contract? I asked him why it wasn't taken from my contract data, on which he explained that if the download is more than the data on my contract, they bill everything out of bundle. He also admitted that this was not in my contract. He referred me to you with my complaint? Nobody else? Financial implication must be communicated to help the customer manage costs.