Explain the 228% increase in my phone bill

My phone bill is normally between R1500 and R1900 per month but in October it was R5200 and in Nov R4500.<br> <br> MTN's Oct invoice says I have international roaming charges to the value of R1700 but I did not travel in October.<br> The November bill says I spent R1200 on out of bundle data. How can this be if I normally am either within limits or go over by R200. What happened to make it so much more expensive for Nov only?<br> And why such a change from Aug/sept? <br> <br> I have asked for itemised billing twice now and still don't have any reports to show how I spent the money on these roaming calls plus no one at MTN can tell me EXACTLY HOW I used that data. Was it on apps/ downloads/ internet usage?<br> The URL report makes no sense to me so I have requested that someone looks at the CDR + explains in detail but I keep getting very basic responses from email or phone queries - none of which ever actually answer my questions.<br> <br> Is there someone senior that I can speak to who can investigate this further and explain to me?<br> <br> I have phoned twice, been to a store in the V+A to speak to someone and emailed the customer care - and I am no closer to any answers.<br> <br> Reference numbers:<br> ***<br> ***<br> ***5