Billing complaint

I have had an MTN contact since probably 2001. I have never had any arrear issues or used above my data allocation. In December 2014, my service was suspended. When I called in I was told that my bill was in excess of R3K and that my data costs was more than R2800 of this. I found this strange as my average bill is around R600 - R700, and I was on holiday my data usage was minimal. I asked for a list of URL's used. My line was opened again (after rebooting for the 20th time and many calls after). I went to the Morningside walk in centre twice in the new year as I had still not received the URLs used. They advised me to pay cash for the call charges after minusing the data charges, and they logged a call for me. My phone was suspended again. Again I called in many times to follow up on the USD that was logged. I had no joy. I then logged another one on the 11 Feb (***).<br> I was told that part of my bill was an error - no explanation. My last interaction was with Nomsa Mkorongo on 20/02/2015, who was of no help. On asking for a list of URLs accessed, she emailed me a calc that was done for the bill. She said the request was not legged, but I am not sure if she understood me.Help!