Incorrect billing

I have now exhausted every avenue to get the incorrect rental charged on my 20mbps adsl home uncapped account resolved. I have lodged more than 15 disputes now without any success reference numbers ********** 2, ********** 6, ********** 3, ********** 7, ********** 5, ********** 3, ********** 8, ********** 6, ********** 6, ********** 1, ********** 8, ********** 8, ********** 6.

Please can someone who are able to resolve this issue with my billing help me to correct this. I am being charged R1700 each month on my home uncapped adsl that is supposed to be all inclusive R999. I am now very tired of trying to get this resolved.