Incorrect billing and line suspension

I was in the process of upgrading my 10mb adsl to 20mb adsl, telkom performed the upgrade then I request to be upgraded to 40mb adsl, telkom then tried to do this but my area did not support it, this caused my package to be modified with a 20mb adsl line and a 40mb uncapped line. I have informed telkom for months that I'm being billed incorrectly and yet internal politics has caused that the issue has not been resolved. My adsl service was suspended due to billing and no one can rectify the problem. Please can someone help me. Ref ********** 9, ********** 45