NEW CHARGES APPEARING ON BILLING / No response

this is a copy of my mail sent to mtn on 1 July 2015, To which I have not had the courtesy of a response, other than their rote automated email response<br> <br> Plse explain 2 items on my latest invoice <br> <br> 1. my overall monthly cost has increased by R25. ???<br> 2. Why am I being charged for blackberry Internet service R51.75. I haven't had a blackberry for more than a year<br> <br> I do expect to receive a response from you within 24 hours<br> <br> Thank you <br> <br> <br> I am so enraged by MTNs attitude towards its clients. I would hope that this course of action garners some level of response