Data details

So MTN has decided that it is humanly possible to go through 1 gig of data a day. In November last year I received a beautiful Cell bill of R6000+ because apparently I had used a substantial chunk of data. Very wierd though because I have used an Iphone now for 2 years and my usage had not changed at all. I phoned MTN in November only to be told that I would have to wait for a URL report. I had the same problem in December but at least I used my loyalty points to buy 2.5GB of data which funnily enough was used up in 3 days. So guess what I phone MTN again, only to be told that it must be right. January and February the same problem so I phoned again and this time was put through to the technical desk who was so awesome as they told me that obviously I am leaving apps open so they spoke me through how to turning everything off - funny though as all were already off... At the end of March I get another R5000+ Cell bill so I succumbed and decided to upgrade to the Sky package. I am still waiting but don't worry MTN my cell phone bills are affordble NOT!!! Can anyone, who gives a damn, actually help me resolve the issues.