******** collection of itemised billing

In May 2014, I asked for itemised billing for ONE billing cycle (explicitly requested on the form provided by MTN). 12 months later, I discover that I have been charged itemised billing for the months since then.<br> <br> On contacting the call centre (including having the phone put down on me twice) I was told this can't be refunded. <br> <br> That makes this unauthorised collection. I want someone who has the power to reverse this to call me ASAP.<br> <br> Thank you