Incorrect billing

I received a shocking data bill around May 2015 (R5000!) when I have never gone over my data limit. I contacted MTN customer service immediately. I kept requesting a detailed statement showing what I was being charged for. Multiple times. Customer Care kept saying they would email it in 24-78 hours, but I never got any email with my detailed statement. THEN my account was handed to the Legal Department, and via the Legal Deprtment, I finally got the requested URL (detailed statement). It shows updates for Microsoft and Bitfender, to name a few, which is impossible since the 3G card was in an iPad (apple software - not Microsoft) with no antivirus app loaded. So I am now certain my bill is incorrect, but MTN just keeps saying I owe that amount. I refuse to pay for charges I did not incur. My credit record is being affected and MTN offers no assistance.