Still waiting for itemised billing

I had data left in Jan 2015, but was charged almost R500 for packet switched data calls. I requested an itemised bill via MTN SP site, but to date I have received nothing, even though it shows that it will charge me for this bill. How do I track this? I'm supposed to receive it via email. I don't want to request it again, as this will probably lead to more charges. Please can someone investigate this problem. I should not be paying for packet switched data calls AT ALL. This only started happening last year when I was waiting for the new iPhone 6 before I renewed my contract - which I did in Jan this year. Still, I was charged for these data calls in Jan again, though I had data left at the end of the month. And nobody wants to assist me without an itemised bill - it's a catch 22!