MTN

For the last 3 months there are content charges on my phone account. The previous 2 months I called each month MTN Costumer Care to cancel all content charges. I don't know where the content charges came from, for I didn't donwload anything new things on my phone and I didn't google on my phone... And every month I also got data charges on the beginning of the new month, despite the fact that I still have prepaid data on my phone that only expiry month end and I'm connected to a wifi at home and at work. This issue is since last year when I upgrade my first phone, and it continued for about 4 months, and after I tell MTN that this is final, other wise I gonna take steps against them. Now, after I upgrade my second phone in January, everything starts again. Same old story... Last month my content charges was over R60 and my date usage was over R70 (despite the fact that there was still prepaid data on my phone AND I receive according to my contract 300mb of data from MTN.) When I check my account this morning via the MTN app, it shows Data usage of 30c and content charge of R10.52. My other account shows data usage of R7.71, despite the fact that there was also prepaid data on, AND I receive 100mb each and every new month from MTN on this account. I can't understand where the data usage came from and what content charge are debit against my account again. And when I call, the consultant just say that they will cancel it, but they can't tell me what it is. It can't go on like this. I'm a client of MTN for a long time now, but I can't take it any more...