MTN IS USELESS AND DOES NOT REPLY OR PROVIDE INFO

I got a bill from mtn saying my invoice is R800 for data usage. I have never in my life used so much data before or after that and did not use data that justifies the bill. I have asked for a URL report to justify what they claim. Now they all play dead and just keep sending me the same **** regarding info but never get round to send me the url that I have asked for. They are *********** and I do not feel happy with them withholding information. They need to proof that I used what they said... why should I pay and keep paying if they do not provide proof... This has been going on since MAY and my patience is finished now!!!!!!